docs: add ratings, devices, and analytics API endpoints

Phase 2 part 5: Split device management and analytics endpoints
- Ratings: get_ratings, create_rating (1-10 scale with half-stars)
- Devices: register_device, list_devices, get_devices, revoke_device
- Analytics: get_analytics (reading statistics)
- Include device registration flow details

docs/api/devices/revoke_device.md

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+# Revoke Device
+
+Revoke access to a device.
+
+**Endpoint**: `DELETE /api/devices/{device_id}`
+**Auth**: Required
+
+## Path Parameters
+
+| Parameter | Type | Required | Description |
+|-----------|------|-----------|-------------|
+| device_id | string | Yes | Device UUID |
+
+## Request Headers
+
+| Header | Type | Required | Description |
+|--------|------|-----------|-------------|
+| Authorization | string | Yes | Bearer token |
+
+### Example Request
+
+```http
+DELETE /api/devices/uuid
+Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
+```
+
+## Response (204 No Content)
+
+Device revoked successfully.
+
+## Error Responses
+
+| Code | Description |
+|------|-------------|
+| 401 | Invalid or expired token |
+| 403 | User does not own this device |
+| 404 | Device not found |
+
+## Try It Out
+
+<!-- API Explorer will be inserted here in Phase 3 -->