feat: indie status page MVP -- FastAPI + SQLite

- 8 DB models (services, incidents, monitors, subscribers, etc.)
- Full CRUD API for services, incidents, monitors
- Public status page with live data
- Incident detail page with timeline
- API key authentication
- Uptime monitoring scheduler
- 13 tests passing
- TECHNICAL_DESIGN.md with full spec

app/templates/subscribe.html

@@ -0,0 +1,12 @@
+{% extends "base.html" %}
+{% block title %}Subscribe{% endblock %}
+{% block content %}
+<div class="subscribe-page">
+    <h1>Subscribe to Updates</h1>
+    <p>Get email notifications when we create or update incidents.</p>
+    <form action="/subscribe" method="POST">
+        <input type="email" name="email" placeholder="you@example.com" required>
+        <button type="submit">Subscribe</button>
+    </form>
+</div>
+{% endblock %}