fix(translator): ESM-safe registry + tool-id pairing + responses max_tokens; add real-creds tests

- translator/index.js: replace require() with static side-effect imports (ESM-safe),
  lazy-init registry maps to survive circular import order
- openai-responses->openai: map max_output_tokens -> max_tokens (avoid leaking field upstream)
- gemini/antigravity -> openai: derive deterministic tool_call id from name so
  functionCall/functionResponse pair correctly (fixes provider tool-pairing 400s)
- add offline unit tests (finish-reason, usage, session-manager, ollama malformed args, const guard)
- add real-creds integration tests (provider-cases + all-formats matrix: 6 inbound formats x 4 scenarios)

Includes co-located provider registry refactor (pricing/capabilities/media providers) and sessionManager updates.

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

open-sse/providers/registry/nanobanana.js

@@ -27,7 +27,7 @@ export default {
     { id: "nanobanana-flash", name: "NanoBanana Flash", params: ["n","size"], kind: "image" },
     { id: "nanobanana-pro", name: "NanoBanana Pro", params: ["n","size"], kind: "image" },
   ],
-  serviceKinds: ["llm","image"],
+  serviceKinds: ["image"],
   imageConfig: {
     baseUrl: "https://api.nanobananaapi.ai/api/v1/nanobanana/generate",
     pollUrl: "https://api.nanobananaapi.ai/api/v1/nanobanana/record-info",