Set up initial project and files

src/types/index.ts

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+// Global environment interface for Cloudflare Workers
+export interface Env {
+  EMAIL_STORAGE: KVNamespace;
+  ADMIN_PASSWORD: string;
+  DOMAIN: string;
+}
+
+// Email interface for stored emails
+export interface EmailData {
+  subject: string;
+  from: string;
+  content: string;
+  receivedAt: number;
+  headers: Record<string, string>;
+}
+
+// Feed configuration interface
+export interface FeedConfig {
+  title: string;
+  description?: string;
+  language: string;
+  site_url: string;
+  feed_url: string;
+  author?: string;
+  created_at: number;
+  updated_at?: number;
+}
+
+// Feed metadata interface
+export interface FeedMetadata {
+  emails: EmailMetadata[];
+}
+
+// Email metadata interface (summary info for listing)
+export interface EmailMetadata {
+  key: string;
+  subject: string;
+  receivedAt: number;
+}
+
+// Feed list interface
+export interface FeedList {
+  feeds: FeedListItem[];
+}
+
+// Feed summary interface (for the global feed list)
+export interface FeedListItem {
+  id: string;
+  title: string;
+}
+
+// Declare KVNamespace for TypeScript
+declare global {
+  // This is not an ideal solution but works for our example
+  interface KVNamespace {
+    get(key: string, options?: { type: 'text' }): Promise<string | null>;
+    get(key: string, options: { type: 'json' }): Promise<any | null>;
+    get(key: string, options: { type: 'arrayBuffer' }): Promise<ArrayBuffer | null>;
+    get(key: string, options: { type: 'stream' }): Promise<ReadableStream | null>;
+    put(key: string, value: string | ArrayBuffer | ReadableStream | FormData): Promise<void>;
+    delete(key: string): Promise<void>;
+    list(options?: { prefix?: string; limit?: number; cursor?: string }): Promise<{
+      keys: { name: string; expiration?: number }[];
+      list_complete: boolean;
+      cursor?: string;
+    }>;
+  }
+}