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>

doc/todo.md

@@ -1,5 +1,14 @@
-# Tori 开发 TODO
+context compaction
 
-所有初始 TODO 已完成。待笨笨指示的事项：
+rag / kb
 
-- [ ] ARM 部署方式（等笨笨说怎么搞）
+template
+
+---
+
+## 代码啰嗦/可精简
+
+- **agent.rs**：`NewRequirement` 与 `Comment` 分支里「设 final_status → 更新 DB status → broadcast WorkflowStatusUpdate → 查 all_steps → generate_report → 更新 report → broadcast ReportReady」几乎相同，可抽成共用函数（如 `finish_workflow_and_report`）；venv 创建/检查（create_dir_all + .venv 存在 + uv venv）两处重复，可抽成 helper。
+- **api/**：`projects.rs`、`workflows.rs`、`timers.rs` 里 `db_err` 与 `ApiResult<T>` 定义重复，可提到 `api/mod.rs` 或公共模块。
+- **WorkflowView.vue**：`handleWsMessage` 里多处 `workflow.value && msg.workflow_id === workflow.value.id`，可先取 `const wf = workflow.value` 并统一判断；`ReportReady` 分支里 `workflow.value = { ...workflow.value, status: workflow.value.status }` 无实际效果，可删或改成真正刷新。
+- **PlanSection.vue / ExecutionSection.vue**：都有 `expandedSteps`(Set)、`toggleStep`、以及 status→icon/label 的映射，可考虑抽成 composable 或共享 util 减少重复。