Agent loop state machine refactor, unified LLM interface, and UI improvements

- Rewrite agent loop as Planning→Executing(N)→Completed state machine with
  per-step context isolation to prevent token explosion
- Split tools and prompts by phase (planning vs execution)
- Add advance_step/save_memo tools for step transitions and cross-step memory
- Unify LLM interface: remove duplicate types, single chat_with_tools path
- Add UTF-8 safe truncation (truncate_str) to prevent panics on Chinese text
- Extract CreateForm component, add auto-scroll to execution log
- Add report generation with app access URL, non-blocking title generation
- Add timer system, file serving, app proxy, exec module
- Update Dockerfile with uv, deployment config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/db.rs

@@ -47,6 +47,7 @@ impl Database {
                 workflow_id TEXT NOT NULL REFERENCES workflows(id),
                 step_order INTEGER NOT NULL,
                 description TEXT NOT NULL,
+                command TEXT NOT NULL DEFAULT '',
                 status TEXT NOT NULL DEFAULT 'pending',
                 output TEXT NOT NULL DEFAULT ''
             )"
@@ -65,6 +66,49 @@ impl Database {
         .execute(&self.pool)
         .await?;
 
+        // Migration: add report column to workflows
+        let _ = sqlx::query(
+            "ALTER TABLE workflows ADD COLUMN report TEXT NOT NULL DEFAULT ''"
+        )
+        .execute(&self.pool)
+        .await;
+
+        // Migration: add created_at to plan_steps
+        let _ = sqlx::query(
+            "ALTER TABLE plan_steps ADD COLUMN created_at TEXT NOT NULL DEFAULT ''"
+        )
+        .execute(&self.pool)
+        .await;
+
+        // Migration: add kind to plan_steps ('plan' or 'log')
+        let _ = sqlx::query(
+            "ALTER TABLE plan_steps ADD COLUMN kind TEXT NOT NULL DEFAULT 'log'"
+        )
+        .execute(&self.pool)
+        .await;
+
+        // Migration: add plan_step_id to plan_steps (log entries reference their parent plan step)
+        let _ = sqlx::query(
+            "ALTER TABLE plan_steps ADD COLUMN plan_step_id TEXT NOT NULL DEFAULT ''"
+        )
+        .execute(&self.pool)
+        .await;
+
+        sqlx::query(
+            "CREATE TABLE IF NOT EXISTS timers (
+                id TEXT PRIMARY KEY,
+                project_id TEXT NOT NULL REFERENCES projects(id),
+                name TEXT NOT NULL,
+                interval_secs INTEGER NOT NULL,
+                requirement TEXT NOT NULL,
+                enabled INTEGER NOT NULL DEFAULT 1,
+                last_run_at TEXT NOT NULL DEFAULT '',
+                created_at TEXT NOT NULL DEFAULT (datetime('now'))
+            )"
+        )
+        .execute(&self.pool)
+        .await?;
+
         Ok(())
     }
 }
@@ -85,6 +129,7 @@ pub struct Workflow {
     pub requirement: String,
     pub status: String,
     pub created_at: String,
+    pub report: String,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
@@ -93,8 +138,12 @@ pub struct PlanStep {
     pub workflow_id: String,
     pub step_order: i32,
     pub description: String,
+    pub command: String,
     pub status: String,
     pub output: String,
+    pub created_at: String,
+    pub kind: String,
+    pub plan_step_id: String,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
@@ -104,3 +153,15 @@ pub struct Comment {
     pub content: String,
     pub created_at: String,
 }
+
+#[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
+pub struct Timer {
+    pub id: String,
+    pub project_id: String,
+    pub name: String,
+    pub interval_secs: i64,
+    pub requirement: String,
+    pub enabled: bool,
+    pub last_run_at: String,
+    pub created_at: String,
+}