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>

tests/unit/openai-to-ollama-malformed.test.js

@@ -0,0 +1,30 @@
+// A4 (case #10): malformed tool_calls args must not throw -> safeParseJSON returns {}.
+import { describe, it, expect } from "vitest";
+import { openaiToOllamaRequest } from "../../open-sse/translator/request/openai-to-ollama.js";
+
+function reqWith(args) {
+  return {
+    messages: [
+      {
+        role: "assistant",
+        content: "",
+        tool_calls: [{ id: "c1", type: "function", function: { name: "get_weather", arguments: args } }],
+      },
+    ],
+  };
+}
+
+describe("openaiToOllamaRequest - tool_calls arguments parsing", () => {
+  it("malformed JSON args -> {} (no throw)", () => {
+    let out;
+    expect(() => {
+      out = openaiToOllamaRequest("m", reqWith("{invalid json"), true);
+    }).not.toThrow();
+    expect(out.messages[0].tool_calls[0].function.arguments).toEqual({});
+  });
+
+  it("valid JSON args -> parsed object", () => {
+    const out = openaiToOllamaRequest("m", reqWith('{"a":1}'), true);
+    expect(out.messages[0].tool_calls[0].function.arguments).toEqual({ a: 1 });
+  });
+});