feat: add statistics API and dashboard for asset metrics

- Implemented `/api/stats` endpoint to return JSON metrics including active assets, total uploads, storage usage, and recent activity.
- Created `stats.html` page to display real-time statistics with auto-refresh functionality.
- Enhanced asset logging to include uploader IP and detailed event information for uploads and deletions.
- Updated asset model to store uploader IP for audit purposes.
- Improved logging functionality to ensure log directory exists before writing.
- Refactored asset creation and management to support new features and logging.

CHANGELOG.md

@@ -0,0 +1,40 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2026-01-09
+
+### Added
+
+- **Statistics Dashboard** (`/stats.html`) with real-time metrics:
+  - Active assets count
+  - Total uploads and deletions
+  - Storage usage
+  - Image vs text breakdown
+  - Average server response time
+  - Total request count
+  - Recent activity feed (last 20 events)
+  - Auto-refresh every 30 seconds
+- **Statistics API** (`GET /api/stats`) returning JSON metrics
+- **Enhanced logging** for asset events:
+  - Upload events with uploader IP, MIME type, size, duration, timestamps
+  - Delete events with full asset metadata
+  - Request timing (`dur_ms`) in access logs
+- **Uploader IP tracking** stored with each asset for audit purposes
+- Stats link in index page footer
+- Ephemeral image and text sharing with configurable TTL (1-60 minutes)
+- Drag/drop, paste, and file picker upload support
+- Base64 encoding for images, raw text for plain text
+- UUID-based asset storage as JSON files
+- Background cleanup task (every 60 seconds)
+- Dark theme UI with zoom overlay
+- View page for shared content
+- Access logging with timing, IPs, and user agent
+- Docker and docker-compose support with Traefik labels
+- Environment variables for bind address and port
+- Access logging with timing, IPs, and user agent
+- Docker and docker-compose support with Traefik labels
+- Environment variables for bind address and port