chore: initialize Guangya Flutter project

lib/app/app.dart

@@ -0,0 +1,48 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shadcn_ui/shadcn_ui.dart';
+import '../providers/theme_provider.dart';
+import '../providers/auth_provider.dart';
+import '../providers/file_provider.dart';
+import '../providers/media_library_provider.dart';
+import '../pages/login_page.dart';
+import '../pages/workspace_page.dart';
+import 'app_theme.dart';
+
+class GuangyaApp extends ConsumerWidget {
+  const GuangyaApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final themeState = ref.watch(themeProvider);
+    final auth = ref.watch(authProvider);
+
+    // Auto-load files when signed in
+    if (auth.isSignedIn) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        final fp = ref.read(fileProvider.notifier);
+        fp.api = ref.read(authProvider.notifier).api;
+        ref.read(mediaLibraryProvider.notifier).api = ref
+            .read(authProvider.notifier)
+            .api;
+        final fileState = ref.read(fileProvider);
+        if (fileState.files.isEmpty && !fileState.isLoading) {
+          fp.loadFiles();
+        }
+      });
+    }
+
+    return ShadApp(
+      title: '光鸭云盘',
+      debugShowCheckedModeBanner: false,
+      theme: lightTheme,
+      darkTheme: darkTheme,
+      themeMode: themeState.themeMode,
+      home: auth.isLoading
+          ? const Scaffold(body: Center(child: CircularProgressIndicator()))
+          : auth.isSignedIn
+          ? const WorkspacePage()
+          : const LoginPage(),
+    );
+  }
+}

lib/app/app_theme.dart

@@ -0,0 +1,152 @@
+import 'dart:ui';
+
+import 'package:flutter/material.dart';
+import 'package:shadcn_ui/shadcn_ui.dart';
+
+// Light theme
+final lightTheme = ShadThemeData(
+  colorScheme: const ShadOrangeColorScheme.light(
+    background: Color(0xFFFFFFFF),
+    foreground: Color(0xFF0F172A),
+    card: Color(0xFFFFFFFF),
+    cardForeground: Color(0xFF0F172A),
+    popover: Color(0xFFFFFFFF),
+    popoverForeground: Color(0xFF0F172A),
+    primary: Color(0xFFF97316),
+    primaryForeground: Color(0xFFFFFFFF),
+    secondary: Color(0xFFF1F5F9),
+    secondaryForeground: Color(0xFF0F172A),
+    muted: Color(0xFFF1F5F9),
+    mutedForeground: Color(0xFF64748B),
+    accent: Color(0xFFF1F5F9),
+    accentForeground: Color(0xFF0F172A),
+    destructive: Color(0xFFEF4444),
+    destructiveForeground: Color(0xFFFFFFFF),
+    border: Color(0xFFE2E8F0),
+    input: Color(0xFFE2E8F0),
+    ring: Color(0xFFF97316),
+    selection: Color(0xFFFB923C),
+  ),
+);
+
+// Dark theme
+final darkTheme = ShadThemeData(
+  colorScheme: const ShadOrangeColorScheme.dark(
+    background: Color(0xFF0F172A),
+    foreground: Color(0xFFF8FAFC),
+    card: Color(0xFF1E293B),
+    cardForeground: Color(0xFFF8FAFC),
+    popover: Color(0xFF1E293B),
+    popoverForeground: Color(0xFFF8FAFC),
+    primary: Color(0xFFF97316),
+    primaryForeground: Color(0xFFFFFFFF),
+    secondary: Color(0xFF1E293B),
+    secondaryForeground: Color(0xFFF8FAFC),
+    muted: Color(0xFF1E293B),
+    mutedForeground: Color(0xFF94A3B8),
+    accent: Color(0xFF1E293B),
+    accentForeground: Color(0xFFF8FAFC),
+    destructive: Color(0xFFEF4444),
+    destructiveForeground: Color(0xFFFFFFFF),
+    border: Color(0xFF334155),
+    input: Color(0xFF334155),
+    ring: Color(0xFFF97316),
+    selection: Color(0xFFFB923C),
+  ),
+);
+
+class GlassCard extends StatelessWidget {
+  final Widget child;
+  final double borderRadius;
+  final EdgeInsets? padding;
+
+  const GlassCard({
+    super.key,
+    required this.child,
+    this.borderRadius = 24,
+    this.padding,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ClipRRect(
+      borderRadius: BorderRadius.circular(borderRadius),
+      child: BackdropFilter(
+        filter: ImageFilter.blur(sigmaX: 8, sigmaY: 8),
+        child: Container(
+          padding: padding ?? const EdgeInsets.all(16),
+          decoration: BoxDecoration(
+            color: Colors.white.withValues(alpha: 0.15),
+            borderRadius: BorderRadius.circular(borderRadius),
+            border: Border.all(
+              color: Colors.white.withValues(alpha: 0.2),
+              width: 1,
+            ),
+          ),
+          child: child,
+        ),
+      ),
+    );
+  }
+}
+
+class OS26Surface extends StatelessWidget {
+  final Widget child;
+
+  const OS26Surface({super.key, required this.child});
+
+  @override
+  Widget build(BuildContext context) {
+    return DecoratedBox(
+      decoration: const BoxDecoration(
+        gradient: LinearGradient(
+          begin: Alignment.topLeft,
+          end: Alignment.bottomRight,
+          colors: [Color(0xFFE9F6F5), Color(0xFFF6FAF6), Color(0xFFF9E6D4)],
+        ),
+      ),
+      child: child,
+    );
+  }
+}
+
+class OS26Glass extends StatelessWidget {
+  final Widget child;
+  final EdgeInsetsGeometry? padding;
+  final double radius;
+  final double opacity;
+  final Border? border;
+
+  const OS26Glass({
+    super.key,
+    required this.child,
+    this.padding,
+    this.radius = 18,
+    this.opacity = 0.48,
+    this.border,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ClipRRect(
+      borderRadius: BorderRadius.circular(radius),
+      child: BackdropFilter(
+        filter: ImageFilter.blur(sigmaX: 22, sigmaY: 22),
+        child: Container(
+          padding: padding,
+          decoration: BoxDecoration(
+            color: Colors.white.withValues(alpha: opacity),
+            borderRadius: BorderRadius.circular(radius),
+            border:
+                border ??
+                Border.all(
+                  color: Colors.white.withValues(alpha: 0.58),
+                  width: 1,
+                ),
+          ),
+          child: child,
+        ),
+      ),
+    );
+  }
+}