release: v1.1.3 — dual-domain separation and URL options

Add admin/image domain separation with host isolation middleware,
optional hide-folder public URLs, GitHub release update check, and
Lucky/Nginx deployment docs. Switch license to GPL-3.0-only.

i18n/locales/en.json

@@ -83,6 +83,17 @@
     "passwordPlaceholder": "Set login password",
     "confirmPlaceholder": "Enter password again",
     "allowRegistration": "Allow user registration",
+    "domainSeparation": "Separate admin and image domains",
+    "domainSeparationHint": "Admin and API use the site URL; image links use a dedicated image URL",
+    "domainSeparationProxyHint": "Point both domains to this host and reverse-proxy to port 6892 (Nginx, Caddy, NPM, etc.)",
+    "domainSeparationProxyExample": "View example",
+    "siteBaseUrl": "Site URL",
+    "siteBaseUrlHint": "No trailing slash; admin UI, API docs, and Twikoo upload endpoint",
+    "siteBaseUrlPlaceholder": "https://admin.example.com",
+    "imageBaseUrl": "Image URL",
+    "imageBaseUrlHint": "No trailing slash; public image link prefix",
+    "imageBaseUrlPlaceholder": "https://pic.example.com",
+    "domainSeparationInvalid": "Enter valid site and image URLs with different hostnames",
     "migrateSubmit": "Complete migration",
     "initSubmit": "Create and continue",
     "migrateSuccess": "Migration complete",
@@ -176,10 +187,22 @@
     "accessControl": "Access control",
     "refererHint": "Referer hotlink protection; comma-separated hostnames, empty = no restriction",
     "refererPlaceholder": "example.com, www.example.com",
-    "linkGeneration": "Link generation",
-    "imageBaseUrlHint": "Public URL prefix for generated links; use your public domain behind a reverse proxy",
+    "linkGeneration": "Domains & links",
+    "domainSeparationActive": "Domain separation enabled: image host serves images only; site host serves admin and API",
+    "siteBaseUrl": "Site URL",
+    "siteBaseUrlHint": "No trailing slash; admin UI, API docs, and Twikoo upload endpoint",
+    "siteBaseUrlPlaceholder": "https://admin.example.com",
+    "siteBaseUrlActive": "Active: {url}",
+    "imageBaseUrl": "Image URL",
+    "imageBaseUrlHint": "No trailing slash; public image link prefix",
+    "imageBaseUrlSingleHint": "No trailing slash; leave empty to use the current request host; single-domain setups do not need a site URL",
     "imageBaseUrlPlaceholder": "https://pic.example.com",
     "imageBaseUrlActive": "Active: {url}",
+    "hideFolderInUrl": "Hide folder in image URLs",
+    "hideFolderInUrlHint": "Links become /2026/08/file.webp without the images/ prefix; legacy full paths still work",
+    "hideFolderConfirmTitle": "Hide folder prefix in URLs?",
+    "hideFolderConfirmDesc": "If two folders share the same year/month/filename (e.g. images/2026/08/a.webp and blog/2026/08/a.webp), the short URL /2026/08/a.webp resolves to the images folder first—you may get the wrong file. Enable only with a single upload folder or globally unique filenames.",
+    "hideFolderConfirmEnable": "Enable anyway",
     "badgeEnv": ".env",
     "badgeSaved": "Saved",
     "badgeDefault": "Default",
@@ -189,6 +212,7 @@
     "tokenNone": "Not configured",
     "apiTokenLine": "API Token · {source} ·",
     "viewReleases": "View releases",
+    "updateAvailable": "Update available: {version}",
     "unsavedChanges": "Unsaved changes",
     "manageToken": "Manage token",
     "envOverride": "Overridden by environment variable; cannot edit in UI",
@@ -390,12 +414,14 @@
       "upload": {
         "title": "Upload images",
         "descAdmin": "Upload one or more images. Use image field; folder creates directory if missing. Also accepts file, files, type.",
-        "descUser": "Upload one or more images via image field. Also accepts file, files. Stored under images/."
+        "descUser": "Upload one or more images via image field. Also accepts file, files. Stored under images/.",
+        "curlCustomFolder": "# Upload to custom folder blog/"
       },
       "list": {
         "title": "List images",
         "descAdmin": "Paginated gallery; optional folder filter. limit default 20, max 100.",
-        "descUser": "Paginated list of your images. limit default 20, max 100."
+        "descUser": "Paginated list of your images. limit default 20, max 100.",
+        "curlFolderFilter": "# Filter by folder"
       },
       "search": {
         "title": "Search images",