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>

src/lib/db/repos/pricingRepo.js

@@ -20,7 +20,7 @@ export async function getPricing() {
   if (cache.value && cache.expiresAt > now) return cache.value;
 
   const userPricing = await getUserPricing();
-  const { PROVIDER_PRICING } = await import("@/shared/constants/pricing.js");
+  const { PROVIDER_PRICING } = await import("open-sse/providers/pricing.js");
   const merged = {};
 
   for (const [provider, models] of Object.entries(PROVIDER_PRICING)) {
@@ -52,7 +52,7 @@ export async function getPricingForModel(provider, model) {
   if (!model) return null;
   const userPricing = await getUserPricing();
   if (provider && userPricing[provider]?.[model]) return userPricing[provider][model];
-  const { getPricingForModel: resolveConst } = await import("@/shared/constants/pricing.js");
+  const { getPricingForModel: resolveConst } = await import("open-sse/providers/pricing.js");
   return resolveConst(provider, model);
 }