refactor(open-sse): P3 provider registry — split into providers/registry/{id}.js

- 100 registry files: transport + models co-located per provider (Mongoose-style)
- providers/shared.js: shared Claude headers + OS/arch helpers (deduped)
- providers/models/helpers.js: withCodexReviewModels (kept dynamic)
- providers/index.js builds PROVIDERS + PROVIDER_MODELS = old API (content byte-for-byte)
- config/providers.js + providerModels.js → barrel re-export, keep accessors + runtime helpers
- Verified: PROVIDERS/MODELS/OAuth/alias byte-for-byte, golden translator tests pass, 0 new regression

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

open-sse/providers/registry/kimi-coding.js

@@ -0,0 +1,20 @@
+import { CLAUDE_API_HEADERS, KIMI_CODING_BASE_URL } from "../shared.js";
+
+export default {
+  id: "kimi-coding",
+  alias: "kmc",
+  transport: {
+    baseUrl: KIMI_CODING_BASE_URL,
+    format: "claude",
+    headers: { ...CLAUDE_API_HEADERS },
+    clientId: "17e5f671-d194-4dfb-9706-5516cb48c098",
+    tokenUrl: "https://auth.kimi.com/api/oauth/token",
+    refreshUrl: "https://auth.kimi.com/api/oauth/token"
+  },
+  models: [
+    { id: "kimi-k2.6", name: "Kimi K2.6" },
+    { id: "kimi-k2.5", name: "Kimi K2.5" },
+    { id: "kimi-k2.5-thinking", name: "Kimi K2.5 Thinking" },
+    { id: "kimi-latest", name: "Kimi Latest" }
+  ]
+};