Add common endpoint support and system prompt injection, v1.1.0

- Add common endpoint type for GLM-4.6 model
- Implement automatic system prompt injection for all requests
- Simplify README documentation for better user focus
- Update version to 1.1.0
- Add *.txt to .gitignore

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "droid2api",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "OpenAI Compatible API Proxy",
   "main": "server.js",
   "type": "module",