feat(providers): add CrofAI as a built-in API-key provider

CrofAI (https://crof.ai) ships an OpenAI-compatible /v1 endpoint with
Bearer auth and a /v1/models discovery route. It hosts a curated set of
hosted open models (DeepSeek V3.2/V4 Pro, Kimi K2.5/K2.6, GLM 4.7/5.x,
Gemma 4, MiniMax M2.5, Qwen3.5/3.6) that today users can only attach
through the generic "Add OpenAI Compatible" flow — losing branding,
defaults, prefix routing, and showing up under "API Key Compatible
Providers" instead of the curated "API Key Providers" section.

This change wires CrofAI as a first-class built-in, mirroring how Kimi
is registered (OpenAI format + bearer auth + seed model list).

Files touched (kept tight):

- src/shared/constants/providers.ts
  Add `crof` to APIKEY_PROVIDERS with id/alias/name/icon/color/textIcon/website.

- src/shared/constants/config.ts
  Register PROVIDER_ENDPOINTS.crof = "https://crof.ai/v1/chat/completions".

- open-sse/config/providerRegistry.ts
  Add a `crof` REGISTRY entry: format "openai", executor "default",
  authType "apikey", authHeader "bearer", and a seed model list pulled
  from a live GET https://crof.ai/v1/models on 2026-04-25 (DeepSeek,
  Kimi, GLM, Gemma, MiniMax, Qwen variants). Runtime /models discovery
  keeps the live catalog up to date.

- src/shared/components/ProviderIcon.tsx
  Map `crof -> "crof"` in PROVIDER_ICON_MAP. Not added to PNG_PROVIDERS
  so the UI falls back to the textIcon ("CR") until a logo asset ships
  at public/providers/crof.png.

- tests/unit/crof-provider.test.ts (new)
  Pins the registration shape (provider identity, base URL, registry
  entry, seed model families). Required by the repo's PR Test Policy.

Verified end-to-end against a locally rebuilt image:
- CrofAI appears under "API Key Providers" alongside GLM Coding/Minimax.
- The connection-add dialog opens with title "Add CrofAI API Key".
- POST /api/providers/validate returns "Valid" against /v1/models.
- POST /api/providers persists a connection (testStatus=active).
- POST /v1/chat/completions { model: "crof/kimi-k2.5", ... } returns 200
  with a real Kimi K2.5 response — full proxy path resolves through the
  new registry entry.
- npm run test:unit passes locally including tests/unit/crof-provider.test.ts.

Notes for the maintainer:

- No logo file is included; happy to follow up with a PNG for
  public/providers/crof.png. Until then the UI uses the "CR" textIcon.
- Pricing (src/shared/constants/pricing.ts) is intentionally not
  hardcoded — CrofAI exposes per-model pricing via /v1/models response,
  and runtime sync is preferable to stale baked-in numbers. Happy to add
  a stub block if requested.
- Anthropic-compatible endpoint (https://anthropic.nahcrof.com/v1/messages)
  is not wired in this PR. Users can still add it via "Add Anthropic
  Compatible" if needed.

src/shared/components/ProviderIcon.tsx

@@ -49,6 +49,7 @@ const LOBEHUB_PROVIDER_MAP: Record<string, string> = {
   "ollama-cloud": "ollama",
   minimax: "minimax",
   "minimax-cn": "minimax",
+  crof: "crof",
   qwen: "qwen",
   alibaba: "qwen",
   moonshot: "moonshot",

src/shared/constants/config.ts

@@ -27,6 +27,7 @@ export const PROVIDER_ENDPOINTS = {
   "kimi-coding-apikey": "https://api.kimi.com/coding/v1/messages",
   minimax: "https://api.minimax.io/anthropic/v1/messages",
   "minimax-cn": "https://api.minimaxi.com/anthropic/v1/messages",
+  crof: "https://crof.ai/v1/chat/completions",
   openai: "https://api.openai.com/v1/chat/completions",
   anthropic: "https://api.anthropic.com/v1/messages",
   gemini: "https://generativelanguage.googleapis.com/v1beta/models",

src/shared/constants/providers.ts

@@ -172,6 +172,15 @@ export const APIKEY_PROVIDERS = {
     textIcon: "MC",
     website: "https://www.minimaxi.com",
   },
+  crof: {
+    id: "crof",
+    alias: "crof",
+    name: "CrofAI",
+    icon: "auto_awesome",
+    color: "#0EA5E9",
+    textIcon: "CR",
+    website: "https://crof.ai",
+  },
   alicode: {
     id: "alicode",
     alias: "alicode",