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>

config/testing.py

@@ -0,0 +1,37 @@
+"""Testing configuration"""
+import os
+import tempfile
+
+class TestingConfig:
+    """Testing environment configuration"""
+    DEBUG = False
+    TESTING = True
+
+    # Security
+    SECRET_KEY = 'test-secret-key'
+
+    # Paths - use temporary directory
+    DATA_DIR = tempfile.mkdtemp()
+
+    # Flask-WTF CSRF - disabled for easier testing
+    WTF_CSRF_ENABLED = False
+
+    # File Upload
+    MAX_CONTENT_LENGTH = 10 * 1024 * 1024  # 10MB
+
+    # AI Integration - mock in tests
+    ANTHROPIC_API_KEY = 'test-api-key'
+
+    # ClamAV - mock in tests
+    CLAMD_SOCKET = '/tmp/test-clamd.ctl'
+
+    # Rate Limiting - disabled for testing
+    RATELIMIT_ENABLED = False
+    RATELIMIT_STORAGE_URL = 'memory://'
+    RATELIMIT_PER_HOUR = 1000  # High limit for testing
+
+    # Session
+    SESSION_COOKIE_SECURE = False
+    SESSION_COOKIE_HTTPONLY = True
+    SESSION_COOKIE_SAMESITE = 'Lax'
+    PERMANENT_SESSION_LIFETIME = 86400