revert: 删除购油方案功能，修复MyDiary模板错误

完全移除oil_plans相关代码：
- 后端: 7个API端点、2个数据库表
- 前端: plans store、Inventory方案UI、UserManagement方案编辑器
- UserMenu: 方案通知按钮
- 修复MyDiary.vue多余的section-card div导致的构建失败

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/database.py

@@ -247,24 +247,6 @@ def init_db():
     if "en_name" not in cols:
         c.execute("ALTER TABLE recipes ADD COLUMN en_name TEXT DEFAULT ''")
 
-    # Oil plans
-    c.execute("""CREATE TABLE IF NOT EXISTS oil_plans (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
-        user_id INTEGER NOT NULL,
-        teacher_id INTEGER,
-        title TEXT DEFAULT '',
-        health_desc TEXT DEFAULT '',
-        status TEXT NOT NULL DEFAULT 'pending',
-        created_at TEXT DEFAULT (datetime('now'))
-    )""")
-    c.execute("""CREATE TABLE IF NOT EXISTS oil_plan_recipes (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
-        plan_id INTEGER NOT NULL REFERENCES oil_plans(id) ON DELETE CASCADE,
-        recipe_name TEXT NOT NULL,
-        ingredients TEXT NOT NULL DEFAULT '[]',
-        times_per_month INTEGER NOT NULL DEFAULT 1
-    )""")
-
     # Seed admin user if no users exist
     count = c.execute("SELECT COUNT(*) FROM users").fetchone()[0]
     if count == 0:

backend/main.py

@@ -1611,200 +1611,8 @@ def recipes_by_inventory(user=Depends(get_current_user)):
     return result
 
 
-# ── Oil Plans (purchase plans) ─────────────────────────
-@app.get("/api/teachers")
-def list_teachers(user=Depends(get_current_user)):
-    conn = get_db()
-    rows = conn.execute(
-        "SELECT id, display_name, username FROM users WHERE role IN ('senior_editor', 'admin') ORDER BY id"
-    ).fetchall()
-    conn.close()
-    return [{"id": r["id"], "display_name": r["display_name"] or r["username"], "username": r["username"]} for r in rows]
-
-
-@app.get("/api/oil-plans")
-def list_oil_plans(user=Depends(get_current_user)):
-    if not user.get("id"):
-        return []
-    conn = get_db()
-    if user["role"] in ("senior_editor", "admin"):
-        plans = conn.execute(
-            "SELECT p.*, u.display_name as user_name, u.username "
-            "FROM oil_plans p LEFT JOIN users u ON p.user_id = u.id "
-            "WHERE p.teacher_id = ? OR p.user_id = ? ORDER BY p.created_at DESC",
-            (user["id"], user["id"])
-        ).fetchall()
-    else:
-        plans = conn.execute(
-            "SELECT p.*, u.display_name as teacher_name "
-            "FROM oil_plans p LEFT JOIN users u ON p.teacher_id = u.id "
-            "WHERE p.user_id = ? ORDER BY p.created_at DESC", (user["id"],)
-        ).fetchall()
-    result = []
-    for p in plans:
-        d = dict(p)
-        recipes = conn.execute(
-            "SELECT id, recipe_name, ingredients, times_per_month FROM oil_plan_recipes WHERE plan_id = ?",
-            (p["id"],)
-        ).fetchall()
-        d["recipes"] = [{"id": r["id"], "recipe_name": r["recipe_name"],
-                         "ingredients": json.loads(r["ingredients"]), "times_per_month": r["times_per_month"]} for r in recipes]
-        result.append(d)
-    conn.close()
-    return result
-
-
-@app.post("/api/oil-plans", status_code=201)
-def create_oil_plan(body: dict, user=Depends(get_current_user)):
-    if not user.get("id"):
-        raise HTTPException(403, "请先登录")
-    health_desc = body.get("health_desc", "").strip()
-    teacher_id = body.get("teacher_id")
-    # Teacher/admin can create plan for a user directly
-    target_user_id = body.get("user_id") if user["role"] in ("senior_editor", "admin") else None
-    if not teacher_id:
-        raise HTTPException(400, "请选择老师")
-    conn = get_db()
-    c = conn.cursor()
-    plan_user_id = target_user_id or user["id"]
-    c.execute("INSERT INTO oil_plans (user_id, teacher_id, health_desc) VALUES (?, ?, ?)",
-              (plan_user_id, teacher_id, health_desc))
-    plan_id = c.lastrowid
-    who = user.get("display_name") or user["username"]
-    conn.execute(
-        "INSERT INTO notifications (target_role, title, body, target_user_id) VALUES (?, ?, ?, ?)",
-        ("admin", "📋 新方案请求", f"{who}：{health_desc[:50]}", teacher_id)
-    )
-    conn.commit()
-    conn.close()
-    return {"id": plan_id}
-
-
-@app.put("/api/oil-plans/{plan_id}")
-def update_oil_plan(plan_id: int, body: dict, user=Depends(get_current_user)):
-    conn = get_db()
-    plan = conn.execute("SELECT * FROM oil_plans WHERE id = ?", (plan_id,)).fetchone()
-    if not plan:
-        conn.close()
-        raise HTTPException(404, "方案不存在")
-    is_teacher = plan["teacher_id"] == user["id"] or user["role"] == "admin"
-    is_owner = plan["user_id"] == user["id"]
-    if not is_teacher and not is_owner:
-        conn.close()
-        raise HTTPException(403, "无权操作")
-    if "health_desc" in body and is_owner:
-        conn.execute("UPDATE oil_plans SET health_desc = ? WHERE id = ?", (body["health_desc"], plan_id))
-        who = user.get("display_name") or user["username"]
-        conn.execute(
-            "INSERT INTO notifications (target_role, title, body, target_user_id) VALUES (?, ?, ?, ?)",
-            ("admin", "📋 方案需求已更新", f"{who} 更新了健康需求：{body['health_desc'][:50]}", plan["teacher_id"])
-        )
-    if "title" in body and is_teacher:
-        conn.execute("UPDATE oil_plans SET title = ? WHERE id = ?", (body["title"], plan_id))
-    if "status" in body and is_teacher:
-        old_status = plan["status"]
-        conn.execute("UPDATE oil_plans SET status = ? WHERE id = ?", (body["status"], plan_id))
-        if body["status"] == "active" and old_status != "active":
-            teacher_name = user.get("display_name") or user["username"]
-            conn.execute(
-                "INSERT INTO notifications (target_role, title, body, target_user_id) VALUES (?, ?, ?, ?)",
-                ("viewer", "🎉 你的购油方案已就绪", f"{teacher_name}老师已为你定制好方案，去库存页查看！", plan["user_id"])
-            )
-    conn.commit()
-    conn.close()
-    return {"ok": True}
-
-
-@app.post("/api/oil-plans/{plan_id}/recipes", status_code=201)
-def add_plan_recipe(plan_id: int, body: dict, user=Depends(get_current_user)):
-    conn = get_db()
-    plan = conn.execute("SELECT * FROM oil_plans WHERE id = ?", (plan_id,)).fetchone()
-    if not plan:
-        conn.close()
-        raise HTTPException(404, "方案不存在")
-    if plan["teacher_id"] != user["id"] and user["role"] != "admin":
-        conn.close()
-        raise HTTPException(403, "无权操作")
-    recipe_name = body.get("recipe_name", "").strip()
-    ingredients = body.get("ingredients", [])
-    times = body.get("times_per_month", 1)
-    if not recipe_name or not ingredients:
-        conn.close()
-        raise HTTPException(400, "配方名和成分不能为空")
-    c = conn.cursor()
-    c.execute("INSERT INTO oil_plan_recipes (plan_id, recipe_name, ingredients, times_per_month) VALUES (?, ?, ?, ?)",
-              (plan_id, recipe_name, json.dumps(ingredients, ensure_ascii=False), times))
-    conn.commit()
-    rid = c.lastrowid
-    conn.close()
-    return {"id": rid}
-
-
-@app.delete("/api/oil-plans/{plan_id}/recipes/{recipe_id}")
-def remove_plan_recipe(plan_id: int, recipe_id: int, user=Depends(get_current_user)):
-    conn = get_db()
-    plan = conn.execute("SELECT * FROM oil_plans WHERE id = ?", (plan_id,)).fetchone()
-    if not plan:
-        conn.close()
-        raise HTTPException(404)
-    if plan["teacher_id"] != user["id"] and user["role"] != "admin":
-        conn.close()
-        raise HTTPException(403)
-    conn.execute("DELETE FROM oil_plan_recipes WHERE id = ? AND plan_id = ?", (recipe_id, plan_id))
-    conn.commit()
-    conn.close()
-    return {"ok": True}
-
-
-@app.get("/api/oil-plans/{plan_id}/shopping-list")
-def plan_shopping_list(plan_id: int, user=Depends(get_current_user)):
-    if not user.get("id"):
-        raise HTTPException(403, "请先登录")
-    conn = get_db()
-    plan = conn.execute("SELECT * FROM oil_plans WHERE id = ?", (plan_id,)).fetchone()
-    if not plan:
-        conn.close()
-        raise HTTPException(404)
-    if plan["user_id"] != user["id"] and plan["teacher_id"] != user["id"] and user["role"] != "admin":
-        conn.close()
-        raise HTTPException(403)
-    recipes = conn.execute("SELECT * FROM oil_plan_recipes WHERE plan_id = ?", (plan_id,)).fetchall()
-    # Calculate monthly drops per oil
-    oil_drops = {}
-    for r in recipes:
-        ings = json.loads(r["ingredients"])
-        for ing in ings:
-            name = ing.get("oil_name") or ing.get("oil", "")
-            drops = ing.get("drops", 0)
-            if name and name != "椰子油":
-                oil_drops[name] = oil_drops.get(name, 0) + drops * r["times_per_month"]
-    # Get oil metadata
-    oils_meta = {}
-    for row in conn.execute("SELECT name, bottle_price, drop_count FROM oils").fetchall():
-        oils_meta[row["name"]] = {"bottle_price": row["bottle_price"], "drop_count": row["drop_count"]}
-    # Get user inventory
-    inv = set(r["oil_name"] for r in conn.execute(
-        "SELECT oil_name FROM user_inventory WHERE user_id = ?", (plan["user_id"],)).fetchall())
-    conn.close()
-    import math
-    result = []
-    for oil, drops in sorted(oil_drops.items()):
-        meta = oils_meta.get(oil, {})
-        drop_count = meta.get("drop_count", 250)
-        bottle_price = meta.get("bottle_price", 0)
-        bottles = math.ceil(drops / drop_count) if drop_count else 1
-        result.append({
-            "oil_name": oil,
-            "monthly_drops": round(drops, 1),
-            "bottles_needed": bottles,
-            "bottle_price": bottle_price,
-            "total_cost": round(bottles * bottle_price, 2),
-            "in_inventory": oil in inv,
-        })
-    result.sort(key=lambda x: (x["in_inventory"], x["oil_name"]))
-    return result
-
 
+# ── Search Logging ─────────────────────────────────────
 # ── Search Logging ─────────────────────────────────────
 @app.post("/api/search-log")
 def log_search(body: dict, user=Depends(get_current_user)):