Made changes to support multiple vaults in Obsidian MCP Server plugin

[mbelinky]

I've made changes to your code to accept multiple vaults.

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[jacksteamdev]

Thanks for making this PR! Multiple vault support will be vaulable for lots of people. These changes are a step in the right direction.

I have two concerns with this PR as-is:

1. I wasn't able to get this PR working on my computer. I'm not sure what's wrong, but I created vaults.json and configured MCP_VAULTS_CONFIG_PATH in claude_desktop_config.json.

2. I think the installation UX for multiple vaults will probably frustrate typical non-technical users.

One of the main goals for an Obsidian plugin is to require little-to-no manual setup. Users should be able to click a button in the options page, and everything is done automatically, or at least through the UI.

This PR introduces a vaults.json file, which makes sense from a developer perspective, but we need to make it accessible to non-technical users, which means creating vaults.json automatically and guiding them through the process of adding vaults.

I know people want multiple vault support, and I really appreciate the time and effort this feature required, but I can't merge this PR without improvements to the user experience.