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/workflows/dependencies.yml

@@ -0,0 +1,126 @@
+name: Update Dependencies
+
+on:
+  schedule:
+    # Run every Monday at 9:00 AM UTC
+    - cron: '0 9 * * 1'
+  workflow_dispatch:
+
+jobs:
+  update-dependencies:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 8
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install cargo-edit
+        run: cargo install cargo-edit
+
+      - name: Update frontend dependencies
+        run: |
+          pnpm update --latest
+          pnpm install
+
+      - name: Update Rust dependencies
+        run: |
+          cargo update
+        working-directory: src-tauri
+
+      - name: Check if build still works
+        run: |
+          pnpm build
+          cargo check --all-targets --all-features
+        working-directory: src-tauri
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: 'chore: update dependencies'
+          title: 'chore: update dependencies'
+          body: |
+            ## Automated Dependency Update
+            
+            This PR updates all dependencies to their latest versions.
+            
+            ### Changes
+            - Updated frontend dependencies via `pnpm update --latest`
+            - Updated Rust dependencies via `cargo update`
+            
+            ### Testing
+            - ✅ Frontend build passes
+            - ✅ Rust compilation check passes
+            
+            Please review the changes and run full tests before merging.
+          branch: chore/update-dependencies
+          delete-branch: true
+
+  security-updates:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 8
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install cargo-audit
+        run: cargo install cargo-audit
+
+      - name: Check for security vulnerabilities
+        run: |
+          echo "## Frontend Security Audit" >> security-report.md
+          pnpm audit --audit-level moderate >> security-report.md || true
+          
+          echo "## Rust Security Audit" >> security-report.md
+          cd src-tauri
+          cargo audit >> ../security-report.md || true
+
+      - name: Create security issue if vulnerabilities found
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const report = fs.readFileSync('security-report.md', 'utf8');
+            
+            if (report.includes('vulnerabilities') || report.includes('RUSTSEC')) {
+              github.rest.issues.create({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                title: '🔒 Security vulnerabilities detected',
+                body: `## Security Audit Report\n\n\`\`\`\n${report}\n\`\`\`\n\nPlease review and update the affected dependencies.`,
+                labels: ['security', 'dependencies']
+              });
+            }