feat: 添加gemini协议适配 (#125)

* feat: 添加gemini协议适配

* Remove unrelated local files from Gemini PR

src/services/api/gemini/modelMapping.ts

@@ -0,0 +1,30 @@
+function getModelFamily(model: string): 'haiku' | 'sonnet' | 'opus' | null {
+  if (/haiku/i.test(model)) return 'haiku'
+  if (/opus/i.test(model)) return 'opus'
+  if (/sonnet/i.test(model)) return 'sonnet'
+  return null
+}
+
+export function resolveGeminiModel(anthropicModel: string): string {
+  if (process.env.GEMINI_MODEL) {
+    return process.env.GEMINI_MODEL
+  }
+
+  const cleanModel = anthropicModel.replace(/\[1m\]$/i, '')
+  const family = getModelFamily(cleanModel)
+
+  if (!family) {
+    return cleanModel
+  }
+
+  const sharedEnvVar = `ANTHROPIC_DEFAULT_${family.toUpperCase()}_MODEL`
+  const resolvedModel = process.env[sharedEnvVar]
+  if (resolvedModel) {
+    return resolvedModel
+  }
+
+  throw new Error(
+    `Gemini provider requires GEMINI_MODEL or ${sharedEnvVar} to be configured.`,
+  )
+}
+