Should allow the backend to use a different port

[failury]

The application stuck at setting up environment because i have a docker container running at port 8000. and here is the backend log

2026-02-02 03:43:57.954 | INFO     | valuecell.server.api.app:lifespan:100 - Initializing database tables...
2026-02-02 03:43:57.961 | INFO     | valuecell.server.db.init_db:initialize:623 - Starting database initialization...
2026-02-02 03:43:57.975 | INFO     | valuecell.server.db.init_db:check_tables_exist:87 - All tables exist: ['agents', 'assets', 'conversation_items', 'conversations', 'strategies', 'strategy_compose_cycles', 'strategy_details', 'strategy_holdings', 'strategy_instructions', 'strategy_portfolio_views', 'strategy_prompts', 'tasks', 'user_profiles', 'watchlist_items', 'watchlists']
2026-02-02 03:43:57.976 | INFO     | valuecell.server.db.init_db:initialize:627 - Database already exists and is properly initialized
2026-02-02 03:43:57.976 | INFO     | valuecell.server.api.app:lifespan:103 - ✓ Database initialized
2026-02-02 03:43:57.976 | INFO     | valuecell.server.api.app:lifespan:111 - Configuring data adapters...
INFO:valuecell.adapters.assets.yfinance_adapter:Yahoo Finance adapter initialized
INFO:valuecell.adapters.assets.manager:Registered adapter: yfinance
2026-02-02 03:43:57.976 | INFO     | valuecell.server.api.app:lifespan:117 - ✓ Yahoo Finance adapter configured
INFO:valuecell.adapters.assets.akshare_adapter:AKShare adapter initialized with caching and field mapping
INFO:valuecell.adapters.assets.manager:Registered adapter: akshare
2026-02-02 03:43:57.976 | INFO     | valuecell.server.api.app:lifespan:124 - ✓ AKShare adapter configured (optimized)
INFO:valuecell.adapters.assets.manager:Registered adapter: baostock
2026-02-02 03:43:57.985 | INFO     | valuecell.server.api.app:lifespan:136 - Data adapters configuration completed
2026-02-02 03:43:57.988 | INFO     | valuecell.server.services.agent_stream_service:_auto_resume_recurring_tasks:118 - Task auto-resume: no recurring running tasks found
2026-02-02 03:43:57.995 | INFO     | valuecell.server.services.strategy_autoresume:auto_resume_strategies:68 - Auto-resume: no eligible strategies found
INFO:     Application startup complete.
ERROR:    [Errno 48] error while attempting to bind on address ('::1', 8000, 0, 0): [errno 48] address already in use
INFO:     Waiting for application shutdown.
2026-02-02 03:43:57.996 | INFO     | valuecell.server.api.app:lifespan:143 - ValueCell Server shutting down...
INFO:     Application shutdown complete.
2026-02-02 03:43:57.996 | INFO     | __main__:request_stop:68 - Shutdown signal propagated to uvicorn
✓ BaoStock adapter configured
Data adapters configuration complete```