feat: add support for ollama RAG providers (#1427)

* fix: openai env

* feat: add support for multiple RAG providers

- Added provider, model and endpoint configuration options for RAG service

- Updated RAG service to support both OpenAI and Ollama providers

- Added Ollama embedding support and dependencies

- Improved environment variable handling for RAG service configuration

Signed-off-by: wfhtqp@gmail.com <wfhtqp@gmail.com>

* fix: update docker env

* feat: rag server add ollama llm

* fix: pre-commit

* feat: check embed model and clean

* docs: add rag server config docs

* fix: pyright ignore

---------

Signed-off-by: wfhtqp@gmail.com <wfhtqp@gmail.com>

lua/avante/config.lua

@@ -35,6 +35,10 @@ M._defaults = {
   tokenizer = "tiktoken",
   rag_service = {
     enabled = false, -- Enables the rag service, requires OPENAI_API_KEY to be set
+    provider = "openai", -- The provider to use for RAG service. eg: openai or ollama
+    llm_model = "", -- The LLM model to use for RAG service
+    embed_model = "", -- The embedding model to use for RAG service
+    endpoint = "https://api.openai.com/v1", -- The API endpoint for RAG service
   },
   web_search_engine = {
     provider = "tavily",