feat: add Gemini-CLI provider support

- Add GeminiCliHandler class to interface with gemini CLI tool
- Implement OAuth authentication flow handling
- Add telemetry collection for token usage tracking
- Create UI component for provider configuration
- Add comprehensive test coverage for the provider
- Support both free and paid (project ID) usage modes

Fixes #6043

Author: roomote

packages/types/src/providers/gemini-cli.ts

@@ -0,0 +1,52 @@
+import type { ModelInfo } from "../model.js"
+
+// Gemini-CLI specific model IDs
+export type GeminiCliModelId = keyof typeof geminiCliModels
+
+export const geminiCliDefaultModelId: GeminiCliModelId = "gemini-2.0-flash-001"
+
+// Models available through Gemini CLI
+export const geminiCliModels = {
+	"gemini-2.0-flash-001": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: true,
+		inputPrice: 0.1,
+		outputPrice: 0.4,
+		cacheReadsPrice: 0.025,
+		cacheWritesPrice: 1.0,
+	},
+	"gemini-1.5-flash-002": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: true,
+		inputPrice: 0.15,
+		outputPrice: 0.6,
+		cacheReadsPrice: 0.0375,
+		cacheWritesPrice: 1.0,
+		tiers: [
+			{
+				contextWindow: 128_000,
+				inputPrice: 0.075,
+				outputPrice: 0.3,
+				cacheReadsPrice: 0.01875,
+			},
+			{
+				contextWindow: Infinity,
+				inputPrice: 0.15,
+				outputPrice: 0.6,
+				cacheReadsPrice: 0.0375,
+			},
+		],
+	},
+	"gemini-1.5-pro-002": {
+		maxTokens: 8192,
+		contextWindow: 2_097_152,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+} as const satisfies Record<string, ModelInfo>

packages/types/src/providers/index.ts

@@ -4,6 +4,7 @@ export * from "./chutes.js"
 export * from "./claude-code.js"
 export * from "./deepseek.js"
 export * from "./gemini.js"
+export * from "./gemini-cli.js"
 export * from "./glama.js"
 export * from "./groq.js"
 export * from "./lite-llm.js"

src/api/index.ts

@@ -28,6 +28,7 @@ import {
 	ChutesHandler,
 	LiteLLMHandler,
 	ClaudeCodeHandler,
+	GeminiCliHandler,
 } from "./providers"
 
 export interface SingleCompletionHandler {
@@ -85,6 +86,8 @@ export function buildApiHandler(configuration: ProviderSettings): ApiHandler {
 			return new LmStudioHandler(options)
 		case "gemini":
 			return new GeminiHandler(options)
+		case "gemini-cli":
+			return new GeminiCliHandler(options)
 		case "openai-native":
 			return new OpenAiNativeHandler(options)
 		case "deepseek":