Add an environment variable to hold ollama instance

[Zelnes]

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…mmitlint/utils.ts):

• update hardcoded URLs with configurable OCO_AI_HOST variable

• add isValidHttpUrl utility function to validate the OCO_AI_HOST value in utils.ts file
• use getConfig() function from commands/config.ts to access OCO_AI_HOST and other config values
• update OllamaAi class in engine/ollama.ts to use the new OCO_AI_HOST configuration value.

Why ?

I tried the tool, and wanted to put llama on a personnal server.

I didn't give much time to test it, only generated this commit with the new export OCO_AI_HOST='http://192.168.1.2:11434'.

I'm not a typescript dev, so please be kind :smile: