feat(update): detect CivitAI paidAccess versions and add hide paid updates (#1060)

CivitAI's PaidAccess cutover deprecated the availability=EarlyAccess and
earlyAccessEndsAt signals; gated versions now report availability=Public
with a paidAccess DTO that LoRA Manager previously ignored, so "Hide
Early Access Updates" missed paid/early-access models and downloads
failed with 401.

Parse and persist paidAccess from model-level, bulk, and by-hash
responses; treat timed paid gates as early access and permanent paid
versions as a distinct is_paid state; add a hide_paid_updates setting
with a "Paid" badge in the versions tab; warn before downloading gated
versions. Includes SQLite migration, i18n for all locales, and
backend/frontend tests.

tests/services/test_base_model_service.py

@@ -82,7 +82,9 @@ class StubUpdateService:
         self.bulk_calls = []
         self.bulk_error = bulk_error
 
-    async def has_updates_bulk(self, model_type, model_ids, hide_early_access: bool = False):
+    async def has_updates_bulk(
+        self, model_type, model_ids, hide_early_access: bool = False, hide_paid: bool = False
+    ):
         self.bulk_calls.append((model_type, list(model_ids)))
         if self.bulk_error:
             raise RuntimeError("bulk failure")
@@ -94,7 +96,9 @@ class StubUpdateService:
             results[model_id] = result
         return results
 
-    async def has_update(self, model_type, model_id, hide_early_access: bool = False):
+    async def has_update(
+        self, model_type, model_id, hide_early_access: bool = False, hide_paid: bool = False
+    ):
         self.calls.append((model_type, model_id))
         result = self.decisions.get(model_id, False)
         if isinstance(result, Exception):