feat: add Vertex AI as embedder provider for codebase indexing

- Add "vertex" to EmbedderProvider type
- Add Vertex AI embedding models (text-embedding-004, text-multilingual-embedding-002, etc.)
- Create VertexEmbedder implementation using OpenAI-compatible approach
- Update service factory to handle vertex provider
- Add vertexOptions to CodeIndexConfig interface
- Update CodeIndexPopover UI to include Vertex AI section
- Add translation keys for Vertex AI
- Add comprehensive tests for VertexEmbedder
- Update type definitions to include vertex in codebaseIndexModels

Closes #6300

Author: roomote

packages/types/src/codebase-index.ts

@@ -21,7 +21,9 @@ export const CODEBASE_INDEX_DEFAULTS = {
 export const codebaseIndexConfigSchema = z.object({
 	codebaseIndexEnabled: z.boolean().optional(),
 	codebaseIndexQdrantUrl: z.string().optional(),
-	codebaseIndexEmbedderProvider: z.enum(["openai", "ollama", "openai-compatible", "gemini", "mistral"]).optional(),
+	codebaseIndexEmbedderProvider: z
+		.enum(["openai", "ollama", "openai-compatible", "gemini", "mistral", "vertex"])
+		.optional(),
 	codebaseIndexEmbedderBaseUrl: z.string().optional(),
 	codebaseIndexEmbedderModelId: z.string().optional(),
 	codebaseIndexEmbedderModelDimension: z.number().optional(),
@@ -48,6 +50,7 @@ export const codebaseIndexModelsSchema = z.object({
 	"openai-compatible": z.record(z.string(), z.object({ dimension: z.number() })).optional(),
 	gemini: z.record(z.string(), z.object({ dimension: z.number() })).optional(),
 	mistral: z.record(z.string(), z.object({ dimension: z.number() })).optional(),
+	vertex: z.record(z.string(), z.object({ dimension: z.number() })).optional(),
 })
 
 export type CodebaseIndexModels = z.infer<typeof codebaseIndexModelsSchema>
@@ -64,6 +67,7 @@ export const codebaseIndexProviderSchema = z.object({
 	codebaseIndexOpenAiCompatibleModelDimension: z.number().optional(),
 	codebaseIndexGeminiApiKey: z.string().optional(),
 	codebaseIndexMistralApiKey: z.string().optional(),
+	codebaseIndexVertexApiKey: z.string().optional(),
 })
 
 export type CodebaseIndexProvider = z.infer<typeof codebaseIndexProviderSchema>

packages/types/src/global-settings.ts

@@ -184,6 +184,7 @@ export const SECRET_STATE_KEYS = [
 	"codebaseIndexOpenAiCompatibleApiKey",
 	"codebaseIndexGeminiApiKey",
 	"codebaseIndexMistralApiKey",
+	"codebaseIndexVertexApiKey",
 	"huggingFaceApiKey",
 ] as const satisfies readonly (keyof ProviderSettings)[]
 export type SecretState = Pick<ProviderSettings, (typeof SECRET_STATE_KEYS)[number]>

webview-ui/src/context/ExtensionStateContext.tsx

@@ -232,7 +232,7 @@ export const ExtensionStateContextProvider: React.FC<{ children: React.ReactNode
 			codebaseIndexSearchMaxResults: undefined,
 			codebaseIndexSearchMinScore: undefined,
 		},
-		codebaseIndexModels: { ollama: {}, openai: {} },
+		codebaseIndexModels: { ollama: {}, openai: {}, vertex: {} },
 		alwaysAllowUpdateTodoList: true,
 		includeDiagnosticMessages: true,
 		maxDiagnosticMessages: 50,