refactor: remove sandbox system and simplify agent architecture

Remove the entire sandbox security system including:
- All sandbox-related Rust code and dependencies (gaol crate)
- Sandbox command handlers and platform-specific implementations
- Comprehensive test suite for sandbox functionality
- Agent sandbox settings UI components

Simplify agent configuration by removing sandbox and permission fields:
- Remove sandbox_enabled, enable_file_read, enable_file_write, enable_network from agent configs
- Update all CC agents to use simplified configuration format
- Remove sandbox references from documentation and UI

src-tauri/tests/TESTS_TASK.md

@@ -13,7 +13,7 @@
    - Created `create_test_binary_with_deps` function
 
 3. **Fixed Database Schema Issue** ✅
-   - Added missing tables (agents, agent_runs, sandbox_violations) to test database
+   - Added missing tables (agents, agent_runs) to test database
    - Fixed foreign key constraint issues
 
 4. **Fixed Mutex Poisoning** ✅
@@ -35,8 +35,8 @@
 7. **Removed All TODOs** ✅
    - No TODOs remain in test code
 
-8. **Handled Platform-Specific Sandbox Limitations** ✅
-   - Tests properly handle macOS sandbox limitations
+8. **Handled Platform-Specific Limitations** ✅
+   - Tests properly handle platform-specific differences
    - Platform-aware assertions prevent false failures
 
 ## Test Results:
@@ -52,4 +52,4 @@ test result: ok. 61 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
 - Comprehensive mock system for external dependencies
 - Platform-aware testing for cross-platform compatibility
 
-The test suite is now production-ready with full coverage and no issues.
+The test suite is now production-ready with full coverage and no issues.