Enhance garbage collection and caching functionality

- Updated .gitignore to include all .exe files and ensure .smashignore is tracked.
- Expanded README.md with advanced configuration options for garbage collection algorithms, detailing available algorithms and use cases.
- Modified launch.json to include memory and disk garbage collection flags for better configuration.
- Refactored root.go to introduce memoryGC and diskGC flags for garbage collection algorithms.
- Implemented hash extraction and verification in steamcache.go to ensure data integrity during caching.
- Added new tests in steamcache_test.go for hash extraction and verification, ensuring correctness of caching behavior.
- Enhanced garbage collection strategies in gc.go, introducing LFU, FIFO, Largest, Smallest, and Hybrid algorithms with corresponding metrics.
- Updated caching logic to conditionally cache responses based on hash verification results.

README.md

@@ -17,6 +17,38 @@ SteamCache2 is a blazing fast download cache for Steam, designed to reduce bandw
     ```sh
     ./SteamCache2 --memory 1G --disk 10G --disk-path tmp/disk
     ```
+
+### Advanced Configuration
+
+#### Garbage Collection Algorithms
+
+SteamCache2 supports multiple garbage collection algorithms for both memory and disk caches:
+
+```sh
+# Use LFU for memory cache (good for long-running servers)
+./SteamCache2 --memory 4G --memory-gc lfu --disk 100G --disk-gc lru
+
+# Use FIFO for predictable eviction (good for testing)
+./SteamCache2 --memory 2G --memory-gc fifo --disk 50G --disk-gc fifo
+
+# Use size-based eviction for disk cache
+./SteamCache2 --memory 1G --disk 200G --disk-gc largest
+```
+
+**Available GC Algorithms:**
+
+- **`lru`** (default): Least Recently Used - evicts oldest accessed files
+- **`lfu`**: Least Frequently Used - evicts least accessed files (good for popular content)
+- **`fifo`**: First In, First Out - evicts oldest created files (predictable)
+- **`largest`**: Size-based - evicts largest files first (maximizes file count)
+- **`smallest`**: Size-based - evicts smallest files first (maximizes cache hit rate)
+- **`hybrid`**: Combines access time and file size for optimal eviction
+
+**Use Cases:**
+- **LAN Events**: Use `lfu` for memory caches to keep popular games
+- **Gaming Cafes**: Use `hybrid` for balanced performance
+- **Testing**: Use `fifo` for predictable behavior
+- **Large Files**: Use `largest` to prioritize keeping many small files
 2. Configure your DNS:
     - If your on Windows and don't want a whole network implementation (THIS)[#windows-hosts-file-override]