Add AISuite LLM support and update dependencies

- Integrate AISuite as a new third-party LLM option
- Update pyproject.toml and uv.lock to include aisuite package
- Modify BaseLLM to support more flexible initialization
- Remove unnecessary LLM imports across multiple files
- Implement AISuiteLLM with basic chat completion functionality

pyproject.toml

@@ -64,6 +64,9 @@ mem0 = ["mem0ai>=0.1.29"]
 docling = [
     "docling>=2.12.0",
 ]
+aisuite = [
+    "aisuite>=0.1.10",
+]
 
 [tool.uv]
 dev-dependencies = [