宜博 / lemongraph

c_pick_folder 补上 Windows（PowerShell FolderBrowserDialog）和 Linux
（zenity 优先、回退 kdialog）实现，三平台都覆盖到。c_project_create
（U-002 已实现的 project_scaffold.create_project()）第一次接上 HTTP
路由 POST /api/projects——backend_server.py 因此第一次需要持有 sqlite
连接，schema.connect() 加 check_same_thread=False 参数，配合
server.conn_lock 序列化 ThreadingHTTPServer 各请求线程的访问。
frontend/app.js 补上 #/setup 真实交互（选文件夹→校验 Git 仓库→非
Git 仓库二次确认→创建→跳转仪表盘），DOM class 命名对齐
docs/wireframes/v_project_setup.html。

REQ-11 完整 happy 用例（含创建 task）还需要 U-023 的
v_goal_composer/c_task_create，本 Unit 只完成 v_project_setup/
c_pick_folder/c_project_create 部分，development-plan.md 已记录。

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/{index.html,app.js,style.css}: no build step, no npm, vanilla JS
hash router (05 §5.7). Real page content is PH3 (U-022+, starting from
docs/wireframes/); this is only the empty shell + working navigation the
Done criterion asks for.

backend_server.py serves the 3 files via an exact-path whitelist (not a
generic static-file/directory server) -- no path-traversal surface to
reason about for 3 fixed files.

Verified in an actual browser this session (navigated to localhost, clicked
all 3 nav links, screenshotted each) rather than only trusting stdlib
tests -- a Python-only test can't exercise real hashchange/DOM behavior
without a JS engine. Nav highlighting and content swap both confirmed
working, no page reload, no build step.

7 new stdlib unittest cases covering what the server is actually
responsible for (static files served with correct content-type, 404 on
unknown GET path). 66 total across U-001-008, all passing.

This closes out PH0 (U-001~U-008) -- all three Phase-acceptance criteria
now hold for real: target-project directory scaffold, 15-table schema with
constraint tests, and a real claude --agent round-trip.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>