feat(api): real klines/trades from indexer + auto table creation

- charts.py: serve OHLCV bars & trades from Postgres (klines/trades tables written by indexer), no synthetic data
- entities.py: add TradeModel/KlineModel matching indexer schema
- main.py: idempotent create_all on startup
- config.py: unify default DATABASE_URL with docker-compose/indexer

app/config.py

@@ -9,8 +9,8 @@ class Settings(BaseSettings):
     # 环境：development, staging, production
     ENVIRONMENT: str = "development"
     
-    # 数据库配置 (PostgreSQL)
-    DATABASE_URL: str = "postgresql+asyncpg://postgres:postgres@localhost:5432/wtfx"
+    # 数据库配置 (PostgreSQL) — 与 docker-compose / indexer 保持一致
+    DATABASE_URL: str = "postgresql+asyncpg://wtfx_user:wtfx_pass@localhost:5432/wtfx_db"
     
     # Redis 配置
     REDIS_URL: str = "redis://localhost:6379/0"