chore: fix local plugin builds & docs (#1851)

Raised by [MitchellThompkins](https://github.com/MitchellThompkins) in
#1848

- Documents how to use Docker to build a local Connect plugin
- Local Plugin flow will now build workspace packages before proceeding
with plugin infra + build
- Removes recommendation to run `pnpm build:watch` from root, as this
race conditions and build cache issues.
- Makes `pnpm dev` from root parallel, preventing servers from blocking
each other.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* Updated development workflow documentation to emphasize Docker-based
plugin builds
* Restructured development modes into three workflows: local Docker
builds, direct deployment, and development servers
  * Updated build and deployment instructions

* **Chores**
  * Modified dev script for parallel execution
  * Refactored build scripts with improved dependency handling

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

api/docs/developer/workflows.md

@@ -62,15 +62,18 @@ To build all packages in the monorepo:
 pnpm build
 ```
 
-### Watch Mode Building
+### Plugin Building (Docker Required)
 
-For continuous building during development:
+The plugin build requires Docker. This command automatically builds all dependencies (API, web) before starting Docker:
 
 ```bash
-pnpm build:watch
+cd plugin
+pnpm run docker:build-and-run
+# Then inside the container:
+pnpm build
 ```
 
-This is useful when you want to see your changes reflected without manually rebuilding. This will also allow you to install a local plugin to test your changes.
+This serves the plugin at `http://YOUR_IP:5858/` for installation on your Unraid server.
 
 ### Package-Specific Building