fix(dev): 启动脚本钉定 .venv 解释器 + watchfiles 降噪 (#75)

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Co-authored-by: guke <guke@autohome.com.cn>
Reviewed-on: #75
Co-authored-by: guke <guke@wonderable.ai>
Co-committed-by: guke <guke@wonderable.ai>

run.bat

@@ -17,6 +17,12 @@ REM avoids CRLF/encoding fights every time someone bash-runs the .sh on Win.
 
 cd /d "%~dp0"
 
+REM Prefer the project virtualenv (.venv) so we never inherit a wrong
+REM global/conda interpreter. FastAPI<0.115 on Pydantic 2.12 crashes at import
+REM with "'FieldInfo' object has no attribute 'in_'". Falls back to PATH python.
+set "PY=python"
+if exist "%~dp0.venv\Scripts\python.exe" set "PY=%~dp0.venv\Scripts\python.exe"
+
 if not exist .env (
     echo [X] Missing .env. Run: copy .env.example .env  and fill JWT_SECRET_KEY ^(plus MT_CPS_* if you test Meituan^)
     exit /b 1
@@ -25,11 +31,11 @@ if not exist .env (
 if not exist data mkdir data
 
 REM Build/upgrade SQLite schema (idempotent; no-op if already at head)
-call alembic upgrade head
+call "%PY%" -m alembic upgrade head
 if errorlevel 1 (
     echo [X] alembic upgrade head failed
     exit /b %errorlevel%
 )
 
 REM Long-running foreground process. Ctrl+C to stop.
-uvicorn app.main:app --host 0.0.0.0 --port 8770 --reload
+"%PY%" -m uvicorn app.main:app --host 0.0.0.0 --port 8770 --reload