feat: complete web application — FastAPI backend + Vue 3 SPA frontend

- Full FastAPI backend with JWT auth, file management, processing pipeline,
  memory CRUD, barcode mappings, config management, cloud sync
- Vue 3 + Element Plus frontend with dashboard, task history, HTTP logs,
  memory editor, barcode editor, config editor, sync page
- HTTP request logging middleware with SQLite persistence
- Task history tracking with progress and retry support
- File metadata recording for upload/download operations
- WebAuth section in config.ini for bcrypt password storage
- Bug fix: logs.py count query returns tuple not dict

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -18,13 +18,8 @@ release/
 logs/
 data/temp/
 
-# Runtime outputs
-data/output/
-data/result/
-data/input/
-data/product_cache.db
-data/user_settings.json
-*.db
+# Runtime data (all runtime outputs, caches, databases)
+data/
 
 # Claude Code / IDE
 .claude/
@@ -34,6 +29,15 @@ data/user_settings.json
 # Old project
 wework_xiaoai_bot/
 
+# Node.js
+node_modules/
+
+# Frontend build output
+web/backend/static/
+
+# Screenshots (from testing)
+*.png
+
 # OS/IDE
 .DS_Store
 Thumbs.db