feat: initial auth rework

AGENTS.md

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+# Core Concepts
+
+Headplane is a web application to manage Headscale, a self-hosted implementation
+of the Tailscale control server. There are a few tenets that guide the entire
+development of the project:
+
+- **Simple starts**: We want to make it as easy as possible to set up and use
+  Headplane, while still providing powerful features for advanced users. This
+  means that we prioritize a clean and intuitive user interface, as well as
+  straightforward installation and configuration processes.
+
+- **No breaking changes**: We want to avoid making breaking changes to the
+  project as much as possible. This means that we will strive to maintain
+  backward compatibility and provide clear migration paths when necessary.
+
+- **Documentation**: This is the most important part of the project, without it
+  the entire project falls apart and is hard to use.
+
+## Project Management
+
+It's hard to manage this project easily, use the `gh` CLI when responding to
+prompts to get context. Some common issue tags to keep track of include a
+"Needs Triage", "Needs Info", "Bug", "Enhancement", and several other tags based
+on what parts of the project are affected.
+
+## Headplane Agent
+
+The Headplane Agent is a lightweight component that runs on the same server as
+Headplane and connects directly to the Tailnet in order to pull in details about
+nodes that aren't available through the Headscale API such as versions, etc.
+
+## WebSSH
+
+This is an ephemeral WASM shim that runs in the browser and connects directly
+to the Tailnet using Tailscale's go packages. It allows anyone to open up an
+ephemeral machine in the Tailnet that directly SSHes into a target node.
+
+## Build/Tooling
+
+Headplane is a React Router 7 (framework mode) project built with Vite. Take
+care to use our preferred PNPM version and Node version as defined in the
+`engines` field of `package.json`. We also use TypeScript Go and Oxfmt for
+type-checking and formatting respectively.
+
+You can also run Headscale CLI commands with
+`docker exec headscale headscale <command>` when the dev environment is running.
+
+## Docs
+
+The project has a documentation site available at the `docs/` directory built
+with VitePress. The documentation is written in Markdown and can be easily
+edited and extended. If making changes to staple features, please take care to
+also update the documentation to reflect any changes in functionality or usage.