移除示例项目初始化并修复前后端稳定性问题

docs/plans/2026-03-30-remove-demo-study-seed-implementation.md

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+# Remove Demo Study Seed Implementation Plan
+
+> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** Stop development initialization from auto-creating any demo study or fee data.
+
+**Architecture:** Remove the application startup hook that seeds demo fee data, while keeping schema setup and protected admin initialization intact. Add a regression test that proves the lifespan startup no longer calls the demo seed helper.
+
+**Tech Stack:** FastAPI, pytest, unittest.mock
+
+---
+
+### Task 1: Lock the startup behavior with a failing test
+
+**Files:**
+- Create: `backend/tests/test_app_startup.py`
+- Modify: `backend/app/main.py`
+
+**Step 1: Write the failing test**
+
+```python
+async def test_development_startup_does_not_seed_demo_fees():
+    ...
+```
+
+**Step 2: Run test to verify it fails**
+
+Run: `pytest backend/tests/test_app_startup.py -q`
+Expected: FAIL because startup still calls `seed_demo_fees`.
+
+**Step 3: Write minimal implementation**
+
+Remove the `seed_demo_fees` import and startup call from `backend/app/main.py`.
+
+**Step 4: Run test to verify it passes**
+
+Run: `pytest backend/tests/test_app_startup.py -q`
+Expected: PASS.
+
+### Task 2: Verify no regression in admin bootstrap
+
+**Files:**
+- Test: `backend/tests/test_protected_admin.py`
+
+**Step 1: Run targeted regression tests**
+
+Run: `pytest backend/tests/test_app_startup.py backend/tests/test_protected_admin.py -q`
+Expected: PASS.