Lazy-import Like model in SqlLikesService

The module-level import of likes.models.like.Like caused ImportError
in non-likes services that register SqlLikesService. Move the import
into a lazy helper called per-method.

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

shared/services/likes_impl.py

@@ -8,7 +8,10 @@ from __future__ import annotations
 from sqlalchemy import select, update, func
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from likes.models.like import Like
+
+def _Like():
+    from likes.models.like import Like
+    return Like
 
 
 class SqlLikesService:
@@ -18,6 +21,7 @@ class SqlLikesService:
         user_id: int, target_type: str,
         target_slug: str | None = None, target_id: int | None = None,
     ) -> bool:
+        Like = _Like()
         if not user_id or not target_type:
             return False
         filters = [
@@ -38,6 +42,7 @@ class SqlLikesService:
         self, session: AsyncSession, *,
         user_id: int, target_type: str,
     ) -> list[str]:
+        Like = _Like()
         if not user_id or not target_type:
             return []
         result = await session.execute(
@@ -54,6 +59,7 @@ class SqlLikesService:
         self, session: AsyncSession, *,
         user_id: int, target_type: str,
     ) -> list[int]:
+        Like = _Like()
         if not user_id or not target_type:
             return []
         result = await session.execute(
@@ -72,6 +78,7 @@ class SqlLikesService:
         target_slug: str | None = None, target_id: int | None = None,
     ) -> bool:
         """Toggle a like. Returns True if now liked, False if unliked."""
+        Like = _Like()
         filters = [
             Like.user_id == user_id,
             Like.target_type == target_type,