Add Flutter project skeleton (Android-only MVP)

Five-layer architecture per DMC_Architektur_und_Design.md: FlightControllerLink
abstraction (Mock + MSP stub), protocol-neutral mission domain layer, App-Mode
state machine with Ready-to-Fly gate, Drift persistence schema, and placeholder
UI screens wired via go_router. App icon generated from design/Y2_pink_dark.svg.
Verified with flutter analyze and flutter test.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/lib/ui/app_shell.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+import '../app_mode/app_mode_cubit.dart';
+import 'screens/fly/fly_screen.dart';
+import 'screens/plan/plan_screen.dart';
+
+/// Schaltet zwischen Plan- und Fly-Screen um, gesteuert von der
+/// App-Mode State Machine (Architektur-Doku 2.2). Connect/Upload sind
+/// Uebergangszustaende innerhalb des Plan-Screens (Handover-Prozess).
+class AppShell extends StatelessWidget {
+  const AppShell({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final mode = context.select((AppModeCubit c) => c.state.mode);
+    return mode == AppMode.fly ? const FlyScreen() : const PlanScreen();
+  }
+}

app/lib/ui/dmc_colors.dart

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+import 'package:flutter/material.dart';
+
+/// Markenfarben, uebernommen aus dem HTML-Demonstrator
+/// ("Drone Mission Control.html"), damit Flutter-UI und Prototyp konsistent
+/// bleiben.
+abstract final class DmcColors {
+  static const setBlue = Color(0xFF4D9DFF);
+  static const setBlueLight = Color(0xFF8FD0FF);
+  static const liveGreen = Color(0xFF3ECF8E);
+  static const warnRed = Color(0xFFE2574A);
+  static const pafAmber = Color(0xFFF0C86E);
+  static const editModeGreen = Color(0xFF50C878);
+  static const flyModeRed = Color(0xFFE2574A);
+}

app/lib/ui/screens/fly/fly_screen.dart

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+import 'package:flutter/material.dart';
+
+/// Fly-Modus: Telemetrie, Draeder, Point-and-Fly-Fadenkreuz
+/// (Architektur-Doku 3.10/3.11). Platzhalter bis Telemetry-Service und
+/// FlightControllerLink verdrahtet sind.
+class FlyScreen extends StatelessWidget {
+  const FlyScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(child: Text('Fly')),
+    );
+  }
+}

app/lib/ui/screens/library/library_screen.dart

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+import 'package:flutter/material.dart';
+
+/// Missionsuebersicht (Architektur-Doku 3.5/7.5): Suche nach Name/Ort/Datum
+/// ueber Drift, sobald AppDatabase verdrahtet ist.
+class LibraryScreen extends StatelessWidget {
+  const LibraryScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Missions')),
+      body: const Center(child: Text('Library')),
+    );
+  }
+}

app/lib/ui/screens/plan/plan_screen.dart

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+import 'package:flutter/material.dart';
+
+/// Missionsplanung: Karte + Wegpunktliste (Architektur-Doku 3.6/3.7).
+/// Kartenintegration (flutter_map) und Fillet-Geometrie folgen als naechster
+/// Schritt - dies ist bewusst nur der Screen-Platzhalter.
+class PlanScreen extends StatelessWidget {
+  const PlanScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(child: Text('Plan')),
+    );
+  }
+}

app/lib/ui/screens/settings/settings_screen.dart

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+import 'package:flutter/material.dart';
+
+/// Drohnen-Profile: FC-Typ, Flugleistungsdaten, Standardprofil T1 Ranger
+/// (Architektur-Doku 3.5).
+class SettingsScreen extends StatelessWidget {
+  const SettingsScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Drone Profiles')),
+      body: const Center(child: Text('Settings')),
+    );
+  }
+}