Optimize CLI implementation using Cobra framework

[Claude]

Enhancement Plan: Comprehensive OpenAPI Integration

Based on the official longbridge-terminal implementation, here's a plan to enrich the longbridge-fs project with additional features while maintaining the file-system paradigm:

Phase 1: Authentication & Configuration (High Priority)

• Add OAuth2 authentication support (alternative to credential file)
• Implement check command for API connectivity testing
• Add configuration management for API endpoints and regions
• Token refresh and management utilities

Phase 2: Enhanced Quote Commands (High Priority)

• Add quote command for real-time quotes of multiple symbols
• Add depth command for order book depth
• Add static command for security static information
• Add kline command for historical candlestick data
• Add trades command for recent tick data
• Add intraday command for minute-by-minute data

Phase 3: Trading Enhancement (Medium Priority)

• Add orders command to list and filter orders
• Add positions command to view current positions
• Add balance command to check account balance
• Add executions command to view trade history
• Implement interactive buy/sell commands with confirmation

Phase 4: Advanced Features (Medium Priority)

• Option chain queries (option-chain, option-quote)
• Warrant information (warrant-list, warrant-quote)
• Capital flow analysis (capital-flow, capital-dist)
• Market temperature indicators
• Trading calendar and session information

Phase 5: Information & News (Low Priority)

• News articles fetching (news, news-detail)
• Regulatory filings (filings, filing-detail)
• Community topics and discussions
• Watchlist management (create/update/delete)

Phase 6: Output Format Enhancement (High Priority)

• Add --format json flag support across all commands
• Maintain table format as default for human readability
• Ensure JSON output is AI-agent friendly

Phase 7: File-System Integration

• Auto-populate quote files when using quote commands
• Command output can be redirected to FS directories
• Background daemon can trigger commands based on file changes
• Integration between CLI commands and FS-based workflow

Implementation Approach

1. Start with Phase 1 (Auth) and Phase 6 (Output Format) as they're foundational
2. Add Phase 2 (Quote Commands) as they're most frequently used
3. Progressively add trading and advanced features
4. Maintain backward compatibility with existing file-based workflow
5. Follow official longbridge-terminal patterns for consistency

Benefits

• AI Agent Compatibility: JSON output format for programmatic access
• Comprehensive API Coverage: Access to full Longbridge OpenAPI features
• Flexible Authentication: OAuth2 + credential file support
• Better UX: Interactive commands with rich output
• Hybrid Model: CLI commands + file-system operations work together