feat: add unified code quality dashboard with multiple validators

- Add validator_type field to scans and violations (architecture,
  security, performance)
- Create security validator with SEC-xxx rules
- Create performance validator with PERF-xxx rules
- Add base validator class for shared functionality
- Add validate_all.py script to run all validators
- Update code quality service with validator type filtering
- Add validator type tabs to dashboard UI
- Add validator type filter to violations list
- Update stats response with per-validator breakdown
- Add security and performance rules documentation
- Add chat-bubble icons to icon library

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.performance-rules/_main.yaml

@@ -0,0 +1,66 @@
+# Performance Rules Configuration
+# ================================
+# Performance-focused validation rules for the codebase.
+# Run with: python scripts/validate_performance.py
+
+version: "1.0"
+project: "letzshop-product-import"
+
+description: |
+  Performance validation rules to detect inefficient patterns and ensure
+  optimal performance across the application.
+
+principles:
+  - name: "Minimize Database Queries"
+    description: "Reduce N+1 queries and optimize data fetching"
+  - name: "Efficient Data Structures"
+    description: "Use appropriate data structures for the task"
+  - name: "Lazy Loading"
+    description: "Load data only when needed"
+  - name: "Caching Strategy"
+    description: "Cache expensive computations and frequent queries"
+  - name: "Async I/O"
+    description: "Use async for I/O-bound operations"
+
+includes:
+  - database.yaml
+  - caching.yaml
+  - api.yaml
+  - async.yaml
+  - memory.yaml
+  - frontend.yaml
+
+severity_levels:
+  error:
+    description: "Critical performance issue that must be fixed"
+    exit_code: 1
+  warning:
+    description: "Performance concern that should be addressed"
+    exit_code: 0
+  info:
+    description: "Performance optimization recommendation"
+    exit_code: 0
+
+ignore:
+  files:
+    - "**/test_*.py"
+    - "**/tests/**"
+    - "**/*_test.py"
+    - "**/conftest.py"
+    - "**/migrations/**"
+    - "**/.venv/**"
+    - "**/venv/**"
+    - "**/node_modules/**"
+    - "**/site/**"
+    - "**/scripts/**"
+    - "**/__pycache__/**"
+    - "**/*.pyc"
+  patterns:
+    # Allow patterns in test files
+    - file: "**/tests/**"
+      pattern: ".*"
+      reason: "Test files may have different performance requirements"
+    # Allow patterns in scripts
+    - file: "**/scripts/**"
+      pattern: "\\.all\\(\\)"
+      reason: "Scripts may need to process all records"