refactor: create llm package with Ollama implementation

[theantichris]

No description provided.

[Copilot]

Pull request overview

This PR refactors the codebase by extracting Ollama-specific LLM functionality into a dedicated internal/llm package. The changes improve code organization by separating concerns and making the LLM client logic reusable.

Key changes:

• Created new internal/llm package with Ollama chat implementation
• Moved chat-related types (ChatRequest, ChatResponse, ChatMessage) from main to the llm package
• Removed getChatResponse function from main and replaced with llm.Chat function

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
internal/llm/ollama.go	New file containing Ollama chat implementation with exported types and Chat function
main.go	Removed chat-related types and getChatResponse function; now uses llm.Chat for communication
main_test.go	Updated to use llm.ChatMessage type; removed TestGetChatResponse test function
.harper-dictionary.txt	Added ChatResponse to dictionary

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