refactor(open-sse): translator DRY + schema enums, bug fixes, dead code cleanup

- Bug B1-B7: media UI m.kind||m.type, serviceKinds, gemini mediaPriority, schema kind, models/info lookup by kind
- Dead code D1-D6: safeParseJSON, drop PROVIDER_ENDPOINTS, orphan fetcher, GITHUB_CONFIG derive, getProviderConfig internal, legacy kiro file
- Translator concerns: toOpenAIUsage, toOpenAIFinish (gemini/kiro/ollama + fix kiro tool finish), thinking effort maps
- Reorg helpers/ → concerns/ (logic) + formats/ (per-format) + schema/ (pure enums: roles/blocks/finishReasons/defaults)
- Wire ~280 hardcoded role/block/finish/default literals to schema enums across 20+ files
- collapseTextParts + extractTextContent dedup
- Normalize translator fn names to openaiToXRequest / xToOpenAIResponse
- Golden tests lock behavior; 0 regression (byte-for-byte providers/alias, 26=26 known fails)

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/providers/registry/gemini.js

@@ -2,6 +2,8 @@ import { GOOGLE_OAUTH_CLIENT } from "../shared.js";
 
 export default {
   id: "gemini",
+  priority: 10,
+  hasFree: true,
   alias: "gemini",
   display: {
     name: "Gemini",
@@ -12,9 +14,9 @@ export default {
     notice: {
       apiKeyUrl: "https://aistudio.google.com/app/apikey",
     },
-    mediaPriority: 1,
   },
   category: "freeTier",
+  mediaPriority: 1,
   transport: {
     baseUrl: "https://generativelanguage.googleapis.com/v1beta/models",
     format: "gemini",