Install server dependencies for Supabase migrations (#70)

Install the oddish server extra in the Supabase migration workflow so Alembic is available before running migrations.

Author: huyouare

.github/workflows/supabase-db-migrations.yml

@@ -41,7 +41,7 @@ jobs:
 
       - name: Sync oddish dependencies
         working-directory: oddish
-        run: uv sync --frozen
+        run: uv sync --frozen --extra server
 
       - name: Run oddish migrations
         working-directory: oddish