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>

web/backend/auth/jwt_handler.py

@@ -0,0 +1,19 @@
+"""JWT token creation and validation"""
+
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+from jose import jwt, JWTError
+
+from ..config import get_or_generate_secret, JWT_ALGORITHM, JWT_EXPIRE_HOURS
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    to_encode = data.copy()
+    expire = datetime.now(timezone.utc) + (expires_delta or timedelta(hours=JWT_EXPIRE_HOURS))
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, get_or_generate_secret(), algorithm=JWT_ALGORITHM)
+
+
+def decode_token(token: str) -> dict:
+    return jwt.decode(token, get_or_generate_secret(), algorithms=[JWT_ALGORITHM])