Add Claude Pro/Max, Mistral, Cerebras and OpenRouter connectors

Closes the Anthropic OAuth gap with a native Claude Pro/Max device sign-in
(reusing the OAuth engine) and adds three OpenAI-compatible API-key
providers. Model lists are sourced from the provider registry. A backfill
migration seeds the new providers into existing organizations idempotently.

AgentCompany-New/tests/contract/provider-contracts.test.ts

@@ -12,8 +12,12 @@ import { PROVIDER_CATALOG } from "../../src/shared/provider-catalog";
 const PROVIDER_SECRET_SAMPLES: Record<string, string> = {
   openai: "sk-live-provider",
   anthropic: "sk-live-provider",
+  "claude-pro": "claude-session-token",
   xai: "sk-live-provider",
   groq: "sk-live-provider",
+  mistral: "sk-live-provider",
+  cerebras: "csk-live-provider",
+  openrouter: "sk-or-live-provider",
   "github-copilot": "ghu_live_provider",
   "google-antigravity": "antigravity-session",
   "gpt-account": "chatgpt-session",

AgentCompany-New/tests/unit/domain-services.test.ts

@@ -24,7 +24,7 @@ describe("domain services", () => {
     const connection = createConnection();
 
     const rows = connection.db.prepare("select version from schema_migrations order by version asc").all() as Array<{ version: number }>;
-    expect(rows.map((row) => row.version)).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35]);
+    expect(rows.map((row) => row.version)).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36]);
     connection.close();
   });