Remove PostgreSQL and move to SQLite3

frontend/src/App.jsx

@@ -30,6 +30,13 @@ export default function App() {
 
   // Auth/Login UI state
   const [me, setMe] = useState(null);
+  const [setupRequired, setSetupRequired] = useState(null);
+  const [setupEmail, setSetupEmail] = useState("");
+  const [setupDisplayName, setSetupDisplayName] = useState("");
+  const [setupPassword, setSetupPassword] = useState("");
+  const [setupPasswordConfirm, setSetupPasswordConfirm] = useState("");
+  const [setupError, setSetupError] = useState("");
+  const [setupSaving, setSetupSaving] = useState(false);
   const [loginEmail, setLoginEmail] = useState("");
   const [loginPassword, setLoginPassword] = useState("");
   const [showPw, setShowPw] = useState(false);
@@ -182,8 +189,12 @@ export default function App() {
   useEffect(() => {
     (async () => {
       try {
+        const status = await api("/setup/status");
+        setSetupRequired(!!status.setup_required);
         await load();
-      } catch {}
+      } catch {
+        // The login/setup screen handles unauthenticated sessions.
+      }
     })();
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
@@ -278,6 +289,36 @@ export default function App() {
     await load();
   };
 
+  const doSetup = async () => {
+    setSetupError("");
+    if (setupPassword.length < 8) {
+      setSetupError("Password must be at least 8 characters long.");
+      return;
+    }
+    if (setupPassword !== setupPasswordConfirm) {
+      setSetupError("Passwords do not match.");
+      return;
+    }
+
+    setSetupSaving(true);
+    try {
+      await api("/setup/admin", {
+        method: "POST",
+        body: JSON.stringify({
+          email: setupEmail,
+          display_name: setupDisplayName,
+          password: setupPassword,
+        }),
+      });
+      setSetupRequired(false);
+      await load();
+    } catch (e) {
+      setSetupError(e?.message || "Setup failed.");
+    } finally {
+      setSetupSaving(false);
+    }
+  };
+
   const doLogout = async () => {
     await api("/auth/logout", { method: "POST" });
     setMe(null);
@@ -540,6 +581,18 @@ export default function App() {
         showPw={showPw}
         setShowPw={setShowPw}
         doLogin={doLogin}
+        setupRequired={setupRequired}
+        setupEmail={setupEmail}
+        setSetupEmail={setSetupEmail}
+        setupDisplayName={setupDisplayName}
+        setSetupDisplayName={setSetupDisplayName}
+        setupPassword={setupPassword}
+        setSetupPassword={setSetupPassword}
+        setupPasswordConfirm={setupPasswordConfirm}
+        setSetupPasswordConfirm={setSetupPasswordConfirm}
+        setupError={setupError}
+        setupSaving={setupSaving}
+        doSetup={doSetup}
       />
     );
   }