fix(providers): require API key for Pollinations and fix optional key i18n labels (#11096) (#11117)

Cherry-picked the value commit (0e918816) onto the current tip, dropping the stale base-red sync commits. Focused tests: pollinations-api-key-required 1/1 plus the whole optional-key suite 142/142 (two legacy assertions in provider-route-schemas flipped to the new key-required contract, commented with the PR). Fixes #11096 — Pollinations answers 401 anonymously now. Thank you @rqzbeh!

src/i18n/messages/en.json

@@ -5692,8 +5692,8 @@
     "aggregatorsGateways": "Aggregators Gateways",
     "enterpriseCloud": "Enterprise & Cloud",
     "apiFormatLabel": "Api Format Label",
-    "apiKeyOptionalHint": "Api Key Optional Hint",
-    "apiKeyOptionalLabel": "Api Key Optional Label",
+    "apiKeyOptionalHint": "Leave empty if your local setup or provider does not require authentication.",
+    "apiKeyOptionalLabel": "API Key (optional)",
     "apiRegionChina": "Api Region China",
     "apiRegionHint": "Api Region Hint",
     "apiRegionInternational": "Api Region International",

src/shared/constants/providers.ts

@@ -237,7 +237,6 @@ export function isSelfHostedChatProvider(providerId: unknown): boolean {
 const EXPLICIT_OPTIONAL_APIKEY_PROVIDER_IDS = new Set([
   "searxng-search",
   "firecrawl",
-  "pollinations",
   "copilot-web",
   "hackclub",
   "g4f-groq",