Fix: Downgrade Appwrite SDK to v4.5.0 for Query compatibility

- Changed appwrite from 5.0.1 to 4.5.0 (stable version)
- Reverted Query.equal syntax to v4.x format (string instead of array)
- Fixes 'request cannot have request body' error
- v4.x is more battle-tested and stable

app/services/appwrite_db.py

@@ -88,7 +88,7 @@ class AppwriteDatabase:
                 database_id=settings.APPWRITE_DATABASE_ID,
                 collection_id=settings.APPWRITE_COLLECTION_ID,
                 queries=[
-                    Query.equal('category', [category]),  # SDK v5+ requires array format
+                    Query.equal('category', category),  # SDK v4.x uses string value
                     Query.order_desc('published_at'),
                     Query.limit(limit)
                 ]
@@ -268,7 +268,7 @@ class AppwriteDatabase:
                     database_id=settings.APPWRITE_DATABASE_ID,
                     collection_id=settings.APPWRITE_COLLECTION_ID,
                     queries=[
-                        Query.equal('category', [category]),  # SDK v5+ requires array format
+                        Query.equal('category', category),  # SDK v4.x uses string value
                         Query.limit(1)
                     ]
                 )

requirements.txt

@@ -30,4 +30,4 @@ email-validator==2.1.0
 sib-api-v3-sdk==7.6.0
 
 # Appwrite Database (Phase 2)
-appwrite==5.0.1
+appwrite==4.5.0