refactor(open-sse): registry consolidation + DRY media/oauth/adhoc cleanup

- Single-source registry: oauth clientId/tokenUrl, usage URLs, image/embed
  configs, search defaultModel, codex fixedPort, google token url derive.
- Remove 29 unused OmniRoute providers (registry 100→71); media intact.
- De-adhoc: codex literals → registry format/oauth flags; reasoningInject,
  image/embed openrouter headers + xai bodyFields config-driven.
- Add REGISTRY_TEMPLATE.js + expand PROVIDER_DEFAULTS/schema JSDoc.
- Baselines updated; PROVIDERS 62 + alias 90 byte-for-byte, golden snapshots.

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

tests/unit/model-name-regex.test.js

@@ -0,0 +1,28 @@
+// Guards C2: regex name fallback (no catalog). Terse entries derive name; existing names untouched.
+import { describe, it, expect } from "vitest";
+import { deriveModelName } from "../../open-sse/providers/models/namePatterns.js";
+import { normalizeModel } from "../../open-sse/providers/models/schema.js";
+
+describe("model name regex fallback (C2)", () => {
+  it("derives display name from id per family", () => {
+    expect(deriveModelName("kimi-k2.5")).toBe("Kimi K2.5");
+    expect(deriveModelName("glm-4.6v")).toBe("GLM 4.6V (Vision)");
+    expect(deriveModelName("minimax-m2.7")).toBe("MiniMax M2.7");
+    expect(deriveModelName("gpt-5.4-mini")).toBe("GPT 5.4 Mini");
+    expect(deriveModelName("grok-4")).toBe("Grok 4");
+  });
+
+  it("falls back to id verbatim when no pattern matches", () => {
+    expect(deriveModelName("some-unknown-model")).toBe("some-unknown-model");
+  });
+
+  it("normalizeModel: explicit name always wins over regex", () => {
+    expect(normalizeModel({ id: "kimi-k2.5", name: "Custom" }).name).toBe("Custom");
+  });
+
+  it("normalizeModel: terse string id becomes object with derived name", () => {
+    const m = normalizeModel("glm-5");
+    expect(m.id).toBe("glm-5");
+    expect(m.name).toBe("GLM 5");
+  });
+});