feat: migrate authentication to Appwrite and remove Better-Auth references

apps/web/src/lib/auth-client.ts

@@ -1,5 +1,67 @@
-import { createAuthClient } from "better-auth/react";
+import { useQuery } from "@tanstack/react-query";
+import type { Models } from "appwrite";
+import { Account, Client, ID } from "appwrite";
 
-export const authClient = createAuthClient({
-  baseURL: import.meta.env.VITE_SERVER_URL,
-});
+// Initialize Appwrite web client
+export const appwriteClient = new Client()
+  .setEndpoint(import.meta.env.VITE_APPWRITE_ENDPOINT)
+  .setProject(import.meta.env.VITE_APPWRITE_PROJECT_ID);
+
+export const account = new Account(appwriteClient);
+
+// Simple session hook using React Query
+export function useSession() {
+  return useQuery({
+    queryKey: ["session", "me"],
+    queryFn: async () => {
+      try {
+        const me = await account.get();
+        return me as Models.User<Models.Preferences>;
+      } catch {
+        return null;
+      }
+    },
+    staleTime: 30_000,
+  });
+}
+
+// Sign up, sign in, sign out helpers
+export const authClient = {
+  useSession,
+  signUp: {
+    email: async ({
+      email,
+      password,
+      name,
+    }: {
+      email: string;
+      password: string;
+      name?: string;
+    }) => {
+      await account.create(ID.unique(), email, password, name);
+      // Immediately create session after sign up
+      await account.createEmailPasswordSession(email, password);
+    },
+  },
+  signIn: {
+    email: async ({ email, password }: { email: string; password: string }) => {
+      await account.createEmailPasswordSession(email, password);
+    },
+  },
+  signOut: async () => {
+    try {
+      await account.deleteSessions();
+    } catch {
+      // ignore
+    }
+  },
+  // Get a short-lived JWT for server-side calls (15 min)
+  getJWT: async (): Promise<string | null> => {
+    try {
+      const jwt = await account.createJWT();
+      return jwt.jwt ?? null;
+    } catch {
+      return null;
+    }
+  },
+};