chore: 工程化改造前的基线快照

在引入 uv 依赖管理、ruff 静态检查与格式化、pyright 类型检查之前，
先把当前可正常运行的状态固定下来，作为后续大规模自动改动的回滚点。

此时状态：97 项测试全绿，HTTP + WebSocket 多牧场服务器可用。

_sync.log

@@ -0,0 +1,33 @@
+Resolved 28 packages in 7ms
+Downloading ruff (10.1MiB)
+ Downloaded ruff
+Prepared 6 packages in 4m 29s
+warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance.
+         If the cache and target directories are on different filesystems, hardlinking may not be supported.
+         If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning.
+Installed 24 packages in 12.11s
+ + annotated-doc==0.0.5
+ + annotated-types==0.8.0
+ + anyio==4.15.1
+ + certifi==2026.7.22
+ + click==8.5.0
+ + fastapi==0.141.1
+ + h11==0.16.0
+ + httpcore==1.0.9
+ + httptools==0.8.0
+ + httpx==0.28.1
+ + idna==3.20
+ + nodeenv==1.10.0
+ + pydantic==2.13.5
+ + pydantic-core==2.46.5
+ + pyright==1.1.414
+ + python-dotenv==1.2.3
+ + pyyaml==6.0.3
+ + ruff==0.16.8
+ + starlette==1.6.0
+ + typing-extensions==4.16.0
+ + typing-inspection==0.4.4
+ + uvicorn==0.53.0
+ + watchfiles==1.2.0
+ + websockets==17.1
+EXIT=0