feat(models): Tag.__table_args__ matches j26042101 indices

Move __table_args__ below column declarations to match the convention
used by SeriesPage, ImportTask, ImageTagPrediction, SuggestionFeedback.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/models.py

@@ -42,6 +42,18 @@ class ImageRecord(db.Model):
     )
 
 class Tag(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(255), nullable=False)
+    kind = db.Column(db.String(64), nullable=True)
+    fandom_id = db.Column(db.Integer, db.ForeignKey("tag.id", ondelete="SET NULL"), nullable=True)
+    fandom = db.relationship("Tag", remote_side="Tag.id", foreign_keys=[fandom_id])
+    images = db.relationship(
+        "ImageRecord",
+        secondary=image_tags,
+        back_populates="tags",
+        passive_deletes=True,
+    )
+
     __table_args__ = (
         db.Index(
             'tag_character_with_fandom_uniq', 'name', 'fandom_id',
@@ -61,18 +73,6 @@ class Tag(db.Model):
         db.Index('tag_kind_idx', 'kind'),
     )
 
-    id = db.Column(db.Integer, primary_key=True)
-    name = db.Column(db.String(255), nullable=False)
-    kind = db.Column(db.String(64), nullable=True)
-    fandom_id = db.Column(db.Integer, db.ForeignKey("tag.id", ondelete="SET NULL"), nullable=True)
-    fandom = db.relationship("Tag", remote_side="Tag.id", foreign_keys=[fandom_id])
-    images = db.relationship(
-        "ImageRecord",
-        secondary=image_tags,
-        back_populates="tags",
-        passive_deletes=True,
-    )
-
     @property
     def display_name(self) -> str:
         """Human-readable rendering of this tag.