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/templates/submission/form.html

@@ -0,0 +1,42 @@
+{% extends "base.html" %}
+
+{% block title %}Submit Feedback - {{ product.name }}{% endblock %}
+
+{% block content %}
+<h1>Submit Feedback</h1>
+<h2>{{ product.name }}</h2>
+
+<p>We value your feedback. Please share your thoughts, report issues, or suggest improvements below.</p>
+
+<form method="POST" enctype="multipart/form-data">
+    <div class="form-group">
+        <label for="feedback_text">Your Feedback</label>
+        <textarea id="feedback_text" name="feedback_text"
+                  placeholder="Describe your feedback in any language..."></textarea>
+        <p style="font-size: 0.9em; color: #666; margin-top: 5px;">
+            You can write in any language. Optional if you attach files.
+        </p>
+    </div>
+
+    <div class="form-group">
+        <label for="files">Attachments (Optional)</label>
+        <input type="file" id="files" name="files" multiple>
+        <p style="font-size: 0.9em; color: #666; margin-top: 5px;">
+            You can attach up to 3 files (max 10MB each). Allowed types: images (PNG, JPG, GIF),
+            documents (PDF, TXT, DOC, DOCX), spreadsheets (XLS, XLSX, CSV).
+        </p>
+    </div>
+
+    <div style="background-color: #f8f9fa; padding: 15px; border-radius: 4px; margin: 20px 0;">
+        <h3 style="margin-top: 0; font-size: 1.1em;">Privacy Notice</h3>
+        <ul style="margin: 10px 0; padding-left: 20px; line-height: 1.8;">
+            <li>Your feedback is submitted anonymously</li>
+            <li>We do not collect or store your IP address</li>
+            <li>All files are scanned for malware</li>
+            <li>Please do not include personal information unless necessary</li>
+        </ul>
+    </div>
+
+    <button type="submit">Submit Feedback</button>
+</form>
+{% endblock %}