fix: resolve broken imports and argument mismatch in API handlers

- Move utils imports to module-level with try/except for relative
  (ComfyUI) and absolute (test runner) import contexts in prompts.py.
  Fixes 500 errors on rating update, prompt save, and prompt edit.
- Add missing None for rating parameter in image scan's save_prompt
  call, which was passing the notes string as rating causing a type
  comparison error during image scanning.

py/api/admin.py

@@ -1065,6 +1065,7 @@ class AdminRoutesMixin:
                                                 prompt_text.strip(),
                                                 "scanned",
                                                 ["auto-scanned"],
+                                                None,
                                                 f"Auto-scanned from {os.path.basename(png_file)}",
                                                 prompt_hash,
                                             )

py/api/prompts.py

@@ -5,6 +5,25 @@ import json
 
 from aiohttp import web
 
+try:
+    from ...utils.validators import (
+        validate_prompt_text,
+        validate_rating,
+        validate_tags,
+        validate_category,
+        sanitize_input,
+    )
+    from ...utils.hashing import generate_prompt_hash
+except ImportError:
+    from utils.validators import (
+        validate_prompt_text,
+        validate_rating,
+        validate_tags,
+        validate_category,
+        sanitize_input,
+    )
+    from utils.hashing import generate_prompt_hash
+
 
 class PromptRoutesMixin:
     """Mixin providing prompt-related API endpoints."""
@@ -491,14 +510,6 @@ class PromptRoutesMixin:
     async def save_prompt(self, request):
         """Save a new prompt with metadata and duplicate detection."""
         try:
-            from utils.validators import (
-                validate_prompt_text,
-                validate_rating,
-                validate_tags,
-                validate_category,
-                sanitize_input,
-            )
-
             data = await request.json()
 
             text = data.get("text", "").strip()
@@ -524,8 +535,6 @@ class PromptRoutesMixin:
 
             text = sanitize_input(text)
 
-            from utils.hashing import generate_prompt_hash
-
             prompt_hash = generate_prompt_hash(text)
 
             existing = await self._run_in_executor(
@@ -608,8 +617,6 @@ class PromptRoutesMixin:
     async def update_prompt(self, request):
         """Update prompt text."""
         try:
-            from utils.validators import validate_prompt_text, sanitize_input
-
             prompt_id = int(request.match_info["prompt_id"])
             data = await request.json()
             new_text = data.get("text", "").strip()
@@ -654,8 +661,6 @@ class PromptRoutesMixin:
     async def update_prompt_rating(self, request):
         """Update prompt rating."""
         try:
-            from utils.validators import validate_rating
-
             prompt_id = int(request.match_info["prompt_id"])
             data = await request.json()
             rating = data.get("rating")