refactor(backend): phase 2 - split commands.rs by domain (100%)
Split monolithic commands.rs (1525 lines) into 7 domain-focused modules
to improve maintainability and readability while preserving the external API.
## Changes
### Module Structure
Created `commands/` directory with domain-based organization:
- **provider.rs** (946 lines, 15 commands)
- Provider CRUD operations (get, add, update, delete, switch)
- Usage query integration
- Endpoint speed testing and custom endpoint management
- Sort order management
- Largest file but highly cohesive (all provider-related)
- **mcp.rs** (235 lines, 13 commands)
- Claude MCP management (~/.claude.json)
- SSOT MCP config management (config.json)
- Sync operations (Claude ↔ Codex)
- Import/export functionality
- **config.rs** (153 lines, 8 commands)
- Config path queries (Claude/Codex)
- Directory operations (open, pick)
- Config status checks
- Parameter compatibility layer (app_type/app/appType)
- **settings.rs** (40 lines, 5 commands)
- App settings management
- App restart functionality
- app_config_dir override (Store integration)
- **plugin.rs** (36 lines, 4 commands)
- Claude plugin management (~/.claude/config.json)
- Plugin status and config operations
- **misc.rs** (45 lines, 3 commands)
- External link handling
- Update checks
- Portable mode detection
- **mod.rs** (15 lines)
- Module exports via `pub use`
- Preserves flat API structure
### API Preservation
- Used `pub use` pattern to maintain external API
- All commands still accessible as `commands::function_name`
- Zero breaking changes for frontend code
- lib.rs invoke_handler unchanged (48 commands registered)
## Statistics
- Files: 1 → 7 (modular organization)
- Lines: 1525 → 1470 (net -55 lines, -3.6%)
- Commands: 48 → 48 (all preserved)
- Average file size: 210 lines (excluding provider.rs)
- Compilation: ✅ Success (6.92s, 0 warnings)
- Tests: ✅ 4/4 passed
## Benefits
- **Maintainability**: Easier to locate and modify domain-specific code
- **Readability**: Smaller files (~200 lines) vs monolithic 1500+ lines
- **Testability**: Can unit test individual modules in isolation
- **Scalability**: Clear pattern for adding new command groups
- **Zero Risk**: No API changes, all tests passing
## Design Decisions
1. **Domain-based split**: Organized by business domain (provider, mcp, config)
rather than technical layers (crud, query, sync)
2. **Preserved provider.rs size**: Kept at 946 lines to maintain high cohesion
(all provider-related operations together). Can be further split in Phase 2.1
if needed.
3. **Parameter compatibility**: Retained multiple parameter names (app_type, app,
appType) for backward compatibility with different frontend call styles
## Phase 2 Status: ✅ 100% Complete
Ready for Phase 3: Adding integration tests.
Co-authored-by: Claude <noreply@anthropic.com>
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