Add waiting system application files

- Add main application files (main.py, models.py, schemas.py, etc.)
- Add routers for all features (waiting, attendance, members, etc.)
- Add HTML templates for admin and user interfaces
- Add migration scripts and utility files
- Add Docker configuration
- Add documentation files
- Add .gitignore to exclude database and cache files

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

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

apply_barcode_migration.py

@@ -0,0 +1,42 @@
+
+import sqlite3
+
+def migrate():
+    db_path = "waiting_system.db"
+    print(f"Connecting to {db_path}...")
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+    
+    try:
+        # 1. Check for duplicate barcodes
+        print("Checking for duplicate barcodes...")
+        cursor.execute("SELECT barcode, COUNT(*) FROM members WHERE barcode IS NOT NULL AND barcode != '' GROUP BY barcode HAVING COUNT(*) > 1")
+        duplicates = cursor.fetchall()
+        
+        if duplicates:
+            print("ERROR: Found duplicates in barcode. Cannot apply unique constraint.")
+            for code, count in duplicates:
+                print(f"  Barcode '{code}': {count} entries")
+            print("Please resolve duplicates manually before applying constraint.")
+            return
+
+        # 2. Drop existing index if exists (SQLAlchemy likely named it ix_members_barcode)
+        print("Dropping old index 'ix_members_barcode' if exists...")
+        cursor.execute("DROP INDEX IF EXISTS ix_members_barcode")
+        
+        # 3. Create Unique Index
+        print("Creating UNIQUE INDEX 'ix_members_barcode'...")
+        # Note: SQLite allows NULLs in UNIQUE columns to be distinct (multiple NULLs ok).
+        # But we also want to ensure empty strings are handled? 
+        # Usually barcode is NULL if empty.
+        cursor.execute("CREATE UNIQUE INDEX ix_members_barcode ON members (barcode)")
+        
+        print("Success! Unique constraint applied to 'barcode'.")
+        
+    except Exception as e:
+        print(f"Migration failed: {e}")
+    finally:
+        conn.close()
+
+if __name__ == "__main__":
+    migrate()