refactor(get_ad_image): put account_id first in the signature

Matches the convention used elsewhere (most account-scoped tools list
account_id first) and groups the account_id + image_hash mode arguments
adjacently.

Author: nictuku

meta_ads_mcp/core/ads.py

@@ -716,26 +716,26 @@ async def get_ad_creatives(ad_id: str, access_token: Optional[str] = None) -> st
 @mcp_server.tool()
 @meta_api_tool
 async def get_ad_image(
+    account_id: Optional[str] = None,
     ad_id: Optional[str] = None,
     image_hash: Optional[str] = None,
-    account_id: Optional[str] = None,
     access_token: Optional[str] = None,
 ) -> Image:
     """
     Get, download, and visualize a Meta ad image in one step. Useful to see the image in the LLM.
 
     Two input modes (provide exactly one):
       1. ad_id only — resolves the ad's creative and fetches the attached image.
-      2. image_hash + account_id — fetches a specific uploaded image by its hash
+      2. account_id + image_hash — fetches a specific uploaded image by its hash
          (e.g. immediately after upload_ad_image or bulk_upload_ad_images, before
          the image is attached to any ad).
 
     Args:
+        account_id: Meta Ads account ID (act_XXXXXXXXX). Required with image_hash.
         ad_id: Meta Ads ad ID (numeric, e.g. "120210000000000000"). Mutually
             exclusive with image_hash.
         image_hash: Meta image hash returned by upload_ad_image /
             bulk_upload_ad_images. Requires account_id.
-        account_id: Meta Ads account ID (act_XXXXXXXXX). Required with image_hash.
         access_token: Meta API access token (optional - will use cached token if not provided)
 
     Returns:
@@ -749,8 +749,8 @@ async def get_ad_image(
 
     if not ad_id:
         return (
-            "Error: Provide either ad_id, or image_hash + account_id. "
-            "Use image_hash + account_id to view an image just returned by "
+            "Error: Provide either ad_id, or account_id + image_hash. "
+            "Use account_id + image_hash to view an image just returned by "
             "upload_ad_image / bulk_upload_ad_images."
         )