feat: Add GitHub Actions workflows for CI/CD

- Add cross-platform build workflow for macOS, Windows, Linux
- Add CI workflow with Rust code quality checks
- Add manual release workflow with automatic asset publishing
- Add dependency management workflow with security monitoring
- Update README with build status badges
- Remove unused Prettier/ESLint configurations
- Focus on Rust code quality and build verification

.github/README.md

@@ -0,0 +1,158 @@
+# GitHub Actions Workflows
+
+This directory contains GitHub Actions workflows for automated CI/CD processes.
+
+## Workflows Overview
+
+### 🔨 `build.yml` - Build Desktop App
+**Triggers:** Push to main/develop, Pull Requests, Releases
+
+**Purpose:** Builds the desktop application for all supported platforms (macOS, Windows, Linux)
+
+**Features:**
+- Cross-platform builds (macOS Universal, Windows x64, Linux x64)
+- Automatic artifact uploads
+- Release asset publishing
+- Caching for faster builds
+
+**Artifacts:**
+- **macOS**: DMG installer and .app bundle
+- **Windows**: MSI and NSIS installers
+- **Linux**: DEB package and AppImage
+
+### 🧪 `ci.yml` - Continuous Integration
+**Triggers:** Push to main/develop, Pull Requests
+
+**Purpose:** Code quality checks and testing
+
+**Features:**
+- Frontend build verification
+- Rust formatting and linting (rustfmt, clippy)
+- Rust unit tests
+- Security audits for both frontend and backend dependencies
+
+### 🚀 `release.yml` - Manual Release
+**Triggers:** Manual workflow dispatch
+
+**Purpose:** Create tagged releases with built applications
+
+**Features:**
+- Manual version input
+- Pre-release option
+- Automatic release notes generation
+- Cross-platform builds and uploads
+- Comprehensive installation instructions
+
+**Usage:**
+1. Go to Actions tab in GitHub
+2. Select "Release" workflow
+3. Click "Run workflow"
+4. Enter version (e.g., v1.0.0)
+5. Choose if it's a pre-release
+6. Click "Run workflow"
+
+### 🔄 `dependencies.yml` - Dependency Management
+**Triggers:** Weekly schedule (Mondays 9 AM UTC), Manual dispatch
+
+**Purpose:** Automated dependency updates and security monitoring
+
+**Features:**
+- Weekly dependency updates
+- Automatic PR creation for updates
+- Security vulnerability detection
+- Automatic issue creation for security alerts
+
+## Setup Requirements
+
+### Repository Secrets
+No additional secrets are required beyond the default `GITHUB_TOKEN`.
+
+### Branch Protection (Recommended)
+Configure branch protection rules for `main` branch:
+- Require status checks to pass before merging
+- Require branches to be up to date before merging
+- Include status checks: `lint-and-test`, `security-audit`
+
+### Release Process
+
+#### Automated (Recommended)
+1. Merge changes to `main` branch
+2. Use the manual release workflow to create a new release
+3. The workflow will automatically build and upload all platform binaries
+
+#### Manual
+1. Create a new tag: `git tag v1.0.0`
+2. Push the tag: `git push origin v1.0.0`
+3. Create a release on GitHub
+4. The build workflow will automatically attach binaries
+
+## Platform-Specific Notes
+
+### macOS
+- Builds universal binaries (Intel + Apple Silicon)
+- Requires macOS 13.0 or later
+- DMG installer includes code signing (if certificates are configured)
+
+### Windows
+- Builds for x64 architecture
+- Provides both MSI and NSIS installers
+- Compatible with Windows 10 and later
+
+### Linux
+- Builds for x64 architecture
+- Provides DEB package for Debian/Ubuntu
+- Provides AppImage for universal Linux compatibility
+- Requires WebKit2GTK and other system dependencies
+
+## Troubleshooting
+
+### Build Failures
+1. Check the specific platform logs in the Actions tab
+2. Ensure all dependencies are properly declared
+3. Verify Tauri configuration is correct
+
+### Security Audit Failures
+1. Review the security report in the workflow logs
+2. Update vulnerable dependencies
+3. Consider using `pnpm audit --fix` for frontend issues
+4. Use `cargo update` for Rust dependency updates
+
+### Cache Issues
+If builds are failing due to cache corruption:
+1. Go to Actions tab
+2. Click on "Caches" in the sidebar
+3. Delete relevant caches
+4. Re-run the workflow
+
+## Customization
+
+### Adding New Platforms
+To add support for additional platforms, modify the `matrix` section in `build.yml`:
+
+```yaml
+matrix:
+  include:
+    - platform: 'macos-latest'
+      args: '--target aarch64-apple-darwin'
+      target: 'aarch64-apple-darwin'
+```
+
+### Modifying Build Steps
+Each workflow can be customized by:
+1. Adding new steps
+2. Modifying existing commands
+3. Adding environment variables
+4. Configuring different Node.js/Rust versions
+
+### Adding Code Quality Tools (Optional)
+If you want to add code quality tools in the future:
+1. **ESLint**: Add ESLint configuration and dependencies for JavaScript/TypeScript linting
+2. **Prettier**: Add Prettier for consistent code formatting
+3. **TypeScript strict checking**: Enable stricter TypeScript rules and type checking
+
+### Changing Schedule
+Modify the `cron` expression in `dependencies.yml` to change the update frequency:
+```yaml
+schedule:
+  - cron: '0 9 * * 1'  # Every Monday at 9 AM UTC
+```