Fix the Ollama Endpoint 404 Error

[RyanNg1403]

Fix Ollama 404 Connection Errors with Incorrect URL Endpoints

Summary

Resolves #159 - Fixes persistent 404 errors when connecting to Ollama API by correcting URL endpoint handling for both LLM and embedding services.

Problem

Users experienced 404 "page not found" errors when setting OLLAMA_BASE_URL=http://localhost:11434. The root cause was inconsistent URL endpoint handling across different services:

• LLM services need OpenAI-compatible /v1 endpoints (e.g., /v1/chat/completions)
• Embedding services need native Ollama /api endpoints (e.g., /api/embeddings)
• Multiple code paths had different default URL patterns
• YAML config expansion bypassed URL normalization logic

Changes Made

1. Fixed LLM Service URL Handling (factory.ts)

• ✅ Handle direct config URLs from YAML expansion (llmConfig.baseURL)
• ✅ Handle environment variable fallbacks (env.OLLAMA_BASE_URL)
• ✅ Ensure /v1 suffix for OpenAI-compatible endpoints
• ✅ Preserve user flexibility for custom endpoints

2. Fixed Embedding Service URL Handling (service-initializer.ts)

• ✅ Remove /v1 suffix when present for embedding fallback
• ✅ Ensure proper base URL for /api/embeddings endpoint
• ✅ Maintain correct defaults for embedding services

Test Cases Now Working

Configuration	LLM Endpoint	Embedding Endpoint
OLLAMA_BASE_URL=http://localhost:11434	http://localhost:11434/v1	http://localhost:11434
OLLAMA_BASE_URL=http://localhost:11434/v1	http://localhost:11434/v1	http://localhost:11434
OLLAMA_BASE_URL=http://localhost:11434/api	http://localhost:11434/api	http://localhost:11434/api
No URL set (default)	http://localhost:11434/v1	http://localhost:11434

Impact

• 🐛 Fixes: Persistent 404 errors with standard Ollama configuration
• ✅ Maintains: Full backward compatibility with existing configurations
• �� Improves: User experience with out-of-the-box Ollama setup
• 🔧 Preserves: Advanced user flexibility for custom endpoints

Testing

• ✅ Code compiles and passes type checking
• ✅ Linting passes
• ✅ Build process completes successfully

Fixes #159