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.

static/css/components/lora-modal/versions.css

@@ -447,6 +447,19 @@
     border-color: color-mix(in oklch, #F59F00 45%, transparent);
 }
 
+/* Paid badge - violet tone (#845EF7) to distinguish from early-access amber */
+.version-badge-paid {
+    background: color-mix(in oklch, #845EF7 25%, transparent);
+    color: #7048E8;
+    border-color: color-mix(in oklch, #845EF7 55%, transparent);
+}
+
+[data-theme="dark"] .version-badge-paid {
+    background: color-mix(in oklch, #845EF7 20%, transparent);
+    color: #9775FA;
+    border-color: color-mix(in oklch, #845EF7 45%, transparent);
+}
+
 .version-meta-ea {
     color: #E67700;
     font-weight: 600;