feat(07-01): create config/ folder and YAML example files

- Added backend.yaml.example with AI, DB, auth, and logging schema
- Added frontend.yaml.example with API and feature flag schema
- Added network.yaml.example with ports and SSL schema
- Added docker.yaml.example with resource and volume schema
- Added secrets.yaml.example as a template for sensitive data
- All files include comprehensive comments documenting every variable

config/frontend.yaml.example

@@ -0,0 +1,63 @@
+# =============================================================================
+# TFM aInventory - Frontend Configuration Schema (v1.12.0)
+# =============================================================================
+# Purpose: Configuration for the Next.js frontend application.
+# =============================================================================
+
+# --- API Connection ---
+api:
+  # Base URL of the backend API
+  # Default: http://localhost:8916
+  # Environment: FRONTEND_API_BACKEND_URL or BACKEND_URL
+  backend_url: "http://localhost:8916"
+
+  # API timeout in milliseconds
+  # Default: 30000 (30 seconds)
+  # Environment: FRONTEND_API_TIMEOUT_MS
+  timeout_ms: 30000
+
+# --- Feature Flags & PWA ---
+features:
+  # Enable PWA service worker?
+  # Default: true
+  service_worker_enabled: true
+
+  # Enable offline functionality?
+  # Default: true
+  offline_enabled: true
+
+  # Enable AI image extraction UI features?
+  # Default: true
+  ai_extraction_ui_enabled: true
+
+# --- PWA Branding ---
+pwa:
+  # Application long name
+  # Default: TFM aInventory
+  app_name: "TFM aInventory"
+
+  # Application short name for home screen
+  # Default: aInventory
+  short_name: "aInventory"
+
+  # Initial URL to open on launch
+  # Default: /
+  start_url: "/"
+
+  # Display mode (standalone|browser|minimal-ui|fullscreen)
+  # Default: standalone
+  display_mode: "standalone"
+
+# --- Feature Toggles ---
+toggles:
+  # Enable built-in QR code scanner?
+  # Default: true
+  enable_qr_scanner: true
+
+  # Enable built-in barcode scanner?
+  # Default: true
+  enable_barcode_scanner: true
+
+  # Enable batch import functionality?
+  # Default: true
+  enable_batch_import: true