feat(api,ui,db): add address, guest users, image URLs; update API

- Backend:
  - Add address column to tickets and migration script
  - Create guest users when user_id is missing; accept user_name and address
  - Normalize stored image paths and expose absolute image_url
  - Introduce utils for path normalization and ticket serialization
  - Add CORS configuration for dashboard/emulator origins
  - Tickets API:
    - Serialize via ticket_to_dict with consistent schema
    - Change status update to PATCH /api/tickets/{id}/status with JSON body
    - Add DELETE /api/tickets/{id} with safe file removal
- Dashboard:
  - Fetch tickets from backend, show thumbnails, absolute image URLs
  - Status select + PATCH updates, toasts for feedback
  - Add i18n key btn.viewDetails
- Mobile app:
  - Persist device user_id via SharedPreferences
  - Fetch and merge API tickets; prefer network imageUrl
  - Submit user_name and address; delete via API when available
  - Make location acquisition robust with fallbacks and non-blocking UX
- Android/deps:
  - Disable Geolocator NMEA listener to prevent crashes
  - Downgrade geolocator to ^11.0.0 for stability

BREAKING CHANGE:
- Status endpoint changed from PATCH /api/tickets/{id}?new_status=... to
  PATCH /api/tickets/{id}/status with JSON body: {"status":"in_progress"}.
- /api/tickets and /api/tickets/{id} responses now use "id" (replacing
  "ticket_id"), include "image_url", and normalize fields for clients. Update
  consumers to use the new schema.

backend/scripts/add_address_column.py

@@ -0,0 +1,33 @@
+import sqlite3
+import os
+import sys
+
+def main():
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    db_path = os.path.normpath(os.path.join(script_dir, '..', 'app', 'db', 'fixmate.db'))
+    print(f"Using database: {db_path}")
+    if not os.path.exists(db_path):
+        print(f"DB not found: {db_path}")
+        return 2
+
+    conn = sqlite3.connect(db_path)
+    try:
+        cur = conn.cursor()
+        cur.execute("PRAGMA table_info(tickets);")
+        cols = [row[1] for row in cur.fetchall()]
+        if 'address' in cols:
+            print("Column 'address' already exists")
+            return 0
+
+        cur.execute("ALTER TABLE tickets ADD COLUMN address TEXT;")
+        conn.commit()
+        print("Added 'address' column to 'tickets' table")
+        return 0
+    except Exception as e:
+        print("Failed to add 'address' column:", e)
+        return 1
+    finally:
+        conn.close()
+
+if __name__ == '__main__':
+    sys.exit(main())