refactor: align backend layout and supabase infra

Consolidate backend modules/tests under the backend package while syncing Supabase compose/env config and related plans.

AGENTS.md

@@ -1,57 +1,19 @@
-## Docker Startup
+## 目录结构
+
+- `infra/`: 基础设施与运维（Docker、脚本、部署相关）
+- `backend/`: FastAPI 后端
+- `apps/`: Flutter 手机端
+- `docs/`: 文档与方案
+
+## Agent 规则分层
+
+- 根目录 `AGENTS.md` 为通用规则，所有修改均需遵守
+- 编辑 `backend/` 目录时，必须同时遵守 `backend/AGENTS.md`
+- 编辑 `apps/` 目录时，必须同时遵守 `apps/AGENTS.md`
+
+## Docker 启动
 
 Always start services with the env file:
 ```bash
 docker compose --env-file .env -f docker/docker-compose.yml up -d
 ```
-
-## Python Environment
-
-**MUST use uv for dependency management and virtual environment execution.**
-
-- All Python commands: `uv run <command>`
-- Add dependencies: `uv add <package>`
-- All dependencies declared in `pyproject.toml`
-
-## Code Quality Checks
-
-**Git pre-commit hook enforces code quality before commit.**
-
-Pre-commit hook automatically runs on api/ directory:
-- `ruff check` - code style and linting
-- `basedpyright` - type checking with error level
-
-If any error detected, commit is rejected. Fix errors before committing.
-Do not bypass or weaken checks (no ignores, disables, or config relaxations). Resolve the underlying issues.
-
-
-## TDD First Policy
-
-**Principle: tests before implementation.**
-
-### Coverage Requirements
-- Minimum coverage: 80%
-- Required test types:
-  - Unit: isolated functions, utilities, components
-  - Integration: API endpoints, database operations
-  - E2E: critical user flows (Playwright)
-
-### Limited Exceptions
-- Docs-only changes (README, comments, formatting) may skip integration/E2E
-- Non-runtime config changes may skip E2E if no behavior changes
-- Any runtime code change requires unit + integration + E2E
-- If an exception is used, record the reason in the PR/test notes
-
-### Mandatory TDD Workflow
-1. Write tests (RED) - they must fail
-2. Run tests - confirm failure
-3. Implement minimal code (GREEN) - only to pass
-4. Run tests - confirm success
-5. Refactor (IMPROVE)
-6. Verify coverage - must be 80%+
-
-### Enforcement
-- Must use the `tdd-guide` agent for new features
-- Do not write implementation before tests
-- Do not lower coverage requirements
-- Must include unit, integration, and E2E tests