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.

locales/zh-CN.json

@@ -622,6 +622,10 @@
             "label": "隐藏抢先体验更新",
             "help": "抢先体验更新"
         },
+        "hidePaidUpdates": {
+            "label": "[TODO: Translate] Hide Paid Updates",
+            "help": "[TODO: Translate] When enabled, models with only paid updates will not show 'Update available' badge"
+        },
         "licenseIcons": {
             "useNewStyle": "使用新版许可协议图标",
             "useNewStyleHelp": "以彩色指示器显示许可权限（新样式），或仅显示限制图标（经典样式）。与当前 CivitAI 设计保持一致。"
@@ -1550,6 +1554,8 @@
                     "newerTooltip": "此版本比你本地的最新版本更新",
                     "earlyAccess": "抢先体验",
                     "earlyAccessTooltip": "此版本当前需要 Civitai 抢先体验权限",
+                    "paid": "[TODO: Translate] Paid",
+                    "paidTooltip": "[TODO: Translate] This version requires payment to download",
                     "ignored": "已忽略",
                     "ignoredTooltip": "此版本已关闭更新通知",
                     "onSiteOnly": "仅站内生成",
@@ -1559,6 +1565,7 @@
                     "download": "下载",
                     "downloadTooltip": "下载此版本",
                     "downloadEarlyAccessTooltip": "从 Civitai 下载此抢先体验版本",
+                    "downloadPaidTooltip": "[TODO: Translate] Download this paid version from Civitai",
                     "downloadNotAllowedTooltip": "此版本仅在 Civitai 站内可用，无法下载",
                     "delete": "删除",
                     "deleteTooltip": "删除此本地版本",