Feat: More Llm API

[CaralHsi]

Description

Summary: (summary)

Fix: #112

Reviewer: @(reviewer)

Checklist:

• I have performed a self-review of my own code | 我已自行检查了自己的代码
• I have commented my code in hard-to-understand areas | 我已在难以理解的地方对代码进行了注释
• I have added tests that prove my fix is effective or that my feature works | 我已添加测试以证明我的修复有效或功能正常
• I have added necessary documentation (if applicable) | 我已添加必要的文档（如果适用）
• I have linked the issue to this PR (if applicable) | 我已将 issue 链接到此 PR（如果适用）
• I have mentioned the person who will review this PR | 我已提及将审查此 PR 的人

[Copilot]

Pull Request Overview

This PR adds support for more LLM API providers by implementing Qwen and DeepSeek integrations with streaming capabilities. The changes extend the existing LLM factory pattern to support additional OpenAI-compatible APIs and enhance reasoning model support with think tag processing.

• Adds QwenLLM and DeepSeekLLM classes that inherit from OpenAILLM for API compatibility
• Implements streaming generation support across OpenAI, Qwen, and DeepSeek LLMs with reasoning content handling
• Updates the base LLM interface to include abstract generate_stream method

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/memos/llms/qwen.py	New QwenLLM implementation with generate and generate_stream methods
src/memos/llms/deepseek.py	New DeepSeekLLM implementation with generate and generate_stream methods
src/memos/llms/openai.py	Added generate_stream method to OpenAILLM and AzureLLM classes
src/memos/llms/base.py	Added abstract generate_stream method to BaseLLM interface
src/memos/configs/llm.py	Added QwenLLMConfig and DeepSeekLLMConfig configurations
src/memos/llms/factory.py	Registered new LLM backends in factory mapping
tests/llms/test_qwen.py	Comprehensive tests for QwenLLM generate and streaming functionality
tests/llms/test_deepseek.py	Comprehensive tests for DeepSeekLLM generate and streaming functionality
tests/llms/test_openai.py	Added streaming tests for OpenAI LLM
examples/basic_modules/llm.py	Added usage examples for new LLM providers
src/memos/templates/mem_reader_prompts.py	Minor language instruction clarification
src/memos/llms/ollama.py	Added NotImplementedError stub for generate_stream