feat(cursor): Integrate Cursor IDE support with OAuth import token flow

- Add CursorExecutor for handling requests to the Cursor API using protobuf over HTTP/2.
- Implement CursorAuthModal for user token import from local SQLite database.
- Update provider models and constants to include Cursor as a supported provider.
- Enhance API service with token validation and user info extraction from Cursor tokens.
- Introduce utility functions for checksum generation and protobuf encoding/decoding for Cursor API interactions.

open-sse/config/constants.js

@@ -149,6 +149,18 @@ export const PROVIDERS = {
     // Kiro OAuth endpoints
     tokenUrl: "https://prod.us-east-1.auth.desktop.kiro.dev/refreshToken",
     authUrl: "https://prod.us-east-1.auth.desktop.kiro.dev"
+  },
+  cursor: {
+    baseUrl: "https://api2.cursor.sh",
+    chatPath: "/aiserver.v1.ChatService/StreamUnifiedChatWithTools",
+    format: "cursor",
+    headers: {
+      "connect-accept-encoding": "gzip",
+      "connect-protocol-version": "1",
+      "Content-Type": "application/connect+proto",
+      "User-Agent": "connect-es/1.6.1"
+    },
+    clientVersion: "1.1.3"
   }
 };
 

open-sse/config/providerModels.js

@@ -73,6 +73,18 @@ export const PROVIDER_MODELS = {
     { id: "claude-sonnet-4.5", name: "Claude Sonnet 4.5" },
     { id: "claude-haiku-4.5", name: "Claude Haiku 4.5" },
   ],
+  cu: [  // Cursor IDE
+    { id: "default", name: "Default (Server Picks)" },
+    { id: "claude-4.5-opus-high-thinking", name: "Claude 4.5 Opus High Thinking" },
+    { id: "claude-4.5-opus-high", name: "Claude 4.5 Opus High" },
+    { id: "claude-4.5-sonnet-thinking", name: "Claude 4.5 Sonnet Thinking" },
+    { id: "claude-4-sonnet", name: "Claude 4 Sonnet" },
+    { id: "gpt-4o", name: "GPT-4o" },
+    { id: "gpt-5.1-codex", name: "GPT 5.1 Codex" },
+    { id: "claude-3.5-sonnet", name: "Claude 3.5 Sonnet" },
+    { id: "gpt-4o-mini", name: "GPT-4o Mini" },
+    { id: "cursor-small", name: "Cursor Small" },
+  ],
 
   // API Key Providers (alias = id)
   openai: [
@@ -149,6 +161,7 @@ export const PROVIDER_ID_TO_ALIAS = {
   antigravity: "ag",
   github: "gh",
   kiro: "kr",
+  cursor: "cu",
   openai: "openai",
   anthropic: "anthropic",
   gemini: "gemini",