diff --git a/frontend/src/config/api-config.ts b/frontend/src/config/api-config.ts
new file mode 100644
index 0000000..f06e944
--- /dev/null
+++ b/frontend/src/config/api-config.ts
@@ -0,0 +1,7 @@
+export const API_CONFIG = {
+  // 优先使用运行时注入的 window.__ENV，其次使用构建时的环境变量，最后回退到默认值
+  BASE_URL:
+    (typeof window !== "undefined" && window.__ENV?.NEXT_PUBLIC_API_BASE_URL)
+      ? window.__ENV.NEXT_PUBLIC_API_BASE_URL
+      : (process.env.NEXT_PUBLIC_API_BASE_URL || "http://localhost:8091/api/v1"),
+};
diff --git a/frontend/src/types/api.ts b/frontend/src/types/api.ts
new file mode 100644
index 0000000..7a92801
--- /dev/null
+++ b/frontend/src/types/api.ts
@@ -0,0 +1,31 @@
+export interface Response<T> {
+    code: string;
+    info: string;
+    data: T;
+}
+
+export interface AiAgentConfigResponseDTO {
+    agentId: string;
+    agentName: string;
+    agentDesc: string;
+}
+
+export interface CreateSessionRequestDTO {
+    agentId: string;
+    userId: string;
+}
+
+export interface CreateSessionResponseDTO {
+    sessionId: string;
+}
+
+export interface ChatRequestDTO {
+    agentId: string;
+    userId: string;
+    sessionId: string;
+    message: string;
+}
+
+export interface ChatResponseDTO {
+    content: string;
+}
diff --git a/frontend/src/types/env.d.ts b/frontend/src/types/env.d.ts
new file mode 100644
index 0000000..759c9bc
--- /dev/null
+++ b/frontend/src/types/env.d.ts
@@ -0,0 +1,9 @@
+declare global {
+  interface Window {
+    __ENV?: {
+      NEXT_PUBLIC_API_BASE_URL: string;
+    };
+  }
+}
+
+export {};