feat: add SQL query presets, shared program form, and loyalty API/admin improvements

- Add Loyalty and Billing SQL query presets to dev tools
- Extract shared program-form.html partial and loyalty-program-form.js mixin
- Refactor admin program-edit to use shared form partial
- Add store loyalty API endpoints for program management

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/loyalty/routes/api/store.py

@@ -153,6 +153,22 @@ def update_program(
     return response
 
 
+@router.delete("/program", status_code=204)
+def delete_program(
+    current_user: User = Depends(get_current_store_api),
+    db: Session = Depends(get_db),
+):
+    """Delete the merchant's loyalty program (merchant_owner only)."""
+    if current_user.role != "merchant_owner":
+        raise AuthorizationException("Only merchant owners can delete programs")
+
+    store_id = current_user.token_store_id
+
+    program = program_service.require_program_by_store(db, store_id)
+    program_service.delete_program(db, program.id)
+    logger.info(f"Store user deleted loyalty program {program.id}")
+
+
 @router.get("/stats", response_model=ProgramStatsResponse)
 def get_stats(
     current_user: User = Depends(get_current_store_api),