Implement MVP: Anonymous feedback submission (User Story 1)

Complete implementation of Phase 1-3 (64 tasks):
- Phase 1: Project setup with Flask, pytest, configuration
- Phase 2: Core infrastructure (auth, models, services, testing)
- Phase 3: Anonymous feedback submission with file uploads

Features:
- Anonymous feedback submission (text and/or up to 3 file attachments)
- Multi-language support (any language accepted)
- File validation (type, size) and virus scanning (ClamAV)
- Product management with active/archived status
- File-based storage with YAML metadata
- User authentication system (Flask-Login)
- CSRF protection and rate limiting
- Test coverage: 10 passing tests (contract + integration)

Security:
- No IP address logging (FR-055 compliance)
- File type whitelist and size limits (10MB max)
- Virus scanning with graceful degradation
- Filename sanitization and secure storage

Test Results:
- 8 contract tests passed
- 2 integration tests passed
- End-to-end workflow verified

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/__init__.py

@@ -0,0 +1,73 @@
+"""Flask application factory"""
+import os
+from flask import Flask
+from flask_login import LoginManager
+from flask_limiter import Limiter
+from flask_limiter.util import get_remote_address
+from flask_wtf.csrf import CSRFProtect
+
+
+def create_app(config_name='development'):
+    """Create and configure the Flask application
+
+    Args:
+        config_name: Configuration environment (development, production, testing)
+
+    Returns:
+        Flask application instance
+    """
+    app = Flask(__name__)
+
+    # Load configuration
+    if config_name == 'production':
+        from config.production import ProductionConfig
+        app.config.from_object(ProductionConfig)
+    elif config_name == 'testing':
+        from config.testing import TestingConfig
+        app.config.from_object(TestingConfig)
+    else:
+        from config.development import DevelopmentConfig
+        app.config.from_object(DevelopmentConfig)
+
+    # Ensure data directory exists
+    os.makedirs(app.config['DATA_DIR'], exist_ok=True)
+
+    # Initialize Flask-WTF CSRF Protection
+    csrf = CSRFProtect()
+    csrf.init_app(app)
+
+    # Initialize Flask-Login
+    login_manager = LoginManager()
+    login_manager.init_app(app)
+    login_manager.login_view = 'auth.login'
+    login_manager.login_message = 'Please log in to access this page.'
+
+    @login_manager.user_loader
+    def load_user(user_id):
+        """Load user by ID for Flask-Login"""
+        from app.models.user import User
+        return User.get_by_id(user_id)
+
+    # Initialize Flask-Limiter
+    limiter = Limiter(
+        app=app,
+        key_func=get_remote_address,
+        storage_uri=app.config['RATELIMIT_STORAGE_URL'],
+        default_limits=[f"{app.config['RATELIMIT_PER_HOUR']}/hour"] if app.config.get('RATELIMIT_ENABLED') else []
+    )
+
+    # Register blueprints
+    from app.routes import submission, dashboard, admin, auth
+    app.register_blueprint(submission.bp)
+    app.register_blueprint(dashboard.bp)
+    app.register_blueprint(admin.bp)
+    app.register_blueprint(auth.bp)
+
+    # Set index route
+    @app.route('/')
+    def index():
+        """Welcome page"""
+        from flask import render_template
+        return render_template('index.html')
+
+    return app