refactor(training): 培训数据层并入唯一总库 app.db（非运行态建表/种子，全列可空）

- 训练 ORM 模型改名回旧表名(accounts/events/bookings/tests/courses/policy_logs/plan_logs/survey_logs)
  并全列可空（兼容按部分字段插入）；alembic 0003 丢弃重建并入唯一总库。
- training/db.py 指向 app.db、移除运行时 init_db；main.py lifespan 移除 init_db。
- seed.py 增培训种子(超管账号/排期/在线课程, 幂等)。
- 验证(真实库 migrate+seed+TestClient)：auth/me、admin/*、park/*、training /api/health|events|courses 全 200。

scripts/db/seed.py

@@ -23,14 +23,37 @@ logging.basicConfig(level=logging.INFO, format="%(levelname)s %(name)s: %(messag
 log = logging.getLogger("db.seed")
 
 
+def _seed_training() -> None:
+    """培训种子（唯一总库 app.db）：超管账号 + 排期 + 在线课程（幂等）。"""
+    import sqlite3
+    import json
+    from app.training import db as tdb
+    conn = sqlite3.connect(tdb.DB_PATH)
+    conn.row_factory = sqlite3.Row
+    try:
+        if conn.execute("SELECT COUNT(*) AS c FROM accounts").fetchone()["c"] == 0:
+            from app.training.auth import hash_password
+            conn.execute("INSERT INTO accounts (id,username,password,name,identities,created_at) VALUES (?,?,?,?,?,?)",
+                         ("U-PINE", "pine", hash_password("123456"), "Pine", json.dumps(["admin"]), tdb.now_iso()))
+        if conn.execute("SELECT COUNT(*) AS c FROM events").fetchone()["c"] == 0:
+            for e in tdb.SEED_EVENTS:
+                conn.execute("INSERT INTO events (id,type,mode,title,subtitle,desc,location,host,image,link,start_at,duration_min,capacity,status) VALUES (:id,:type,:mode,:title,:subtitle,:desc,:location,:host,:image,:link,:start_at,:duration_min,:capacity,:status)", e)
+        if conn.execute("SELECT COUNT(*) AS c FROM courses").fetchone()["c"] == 0:
+            for c in tdb.SEED_COURSES:
+                conn.execute("INSERT INTO courses (id,category,level,title,subtitle,desc,price,status,start_at,end_at,venue,quota,image,host,created_at) VALUES (:id,:category,:level,:title,:subtitle,:desc,:price,:status,:start_at,:end_at,:venue,:quota,:image,:host,:created_at)", c)
+        conn.commit()
+        log.info("培训种子完成（账号/排期/课程）")
+    finally:
+        conn.close()
+
+
 async def run() -> None:
     db = Database()
     try:
-        # 平台种子（角色/权限/用户/政务/OPC/投资人/工作台等，幂等）
         await platform_seed(db.session)
         await db.session.commit()
         log.info("平台种子完成：%s", config.DATABASE_URL)
-        # TODO(P2/P3 后)：园区默认园区+企业、培训事件课程 经 serverdata/seed/*.json 灌入（当前由各自子应用迁移后接入）
+        _seed_training()
     except Exception as e:  # noqa: BLE001
         await db.session.rollback()
         log.error("种子失败：%s", e)