feat: add EnableUI setting to gate webapp product registration

[fmartingr]

Summary

• Adds a new EnableUI boolean plugin setting (default: false) to control whether the Channel Automation product appears in the webapp product switcher
• Adds a GET /api/v1/config endpoint that returns client-relevant configuration to the webapp
• Webapp now fetches the config on initialization and skips product registration when enable_ui is false, keeping the product switcher clean by default

Test plan

• Verify that with EnableUI set to false (default), the Channel Automation product does not appear in the product switcher
• Verify that with EnableUI set to true, the product appears and functions normally
• Verify GET /api/v1/config returns {"enable_ui": false} by default and {"enable_ui": true} when configured
• Verify unauthenticated requests to /api/v1/config return 401
• Run make test to confirm all new and existing tests pass

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[Copilot]

Pull request overview

This PR adds an EnableUI plugin setting that controls whether the Channel Automation product is registered in the Mattermost webapp product switcher. A new GET /api/v1/config endpoint exposes client-relevant configuration, and the webapp fetches it during initialization to conditionally skip product registration.

Changes:

• New EnableUI boolean setting in plugin.json and configuration struct (default false)
• New GET /api/v1/config endpoint returning client config, with authentication enforced by existing middleware
• Webapp fetches config on init and skips product registration when enable_ui is false

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
server/configuration.go	Adds EnableUI field to the configuration struct
server/api.go	Adds /config route and handleGetClientConfig handler
webapp/src/client.ts	Adds ClientConfig type and getConfig() fetch function
webapp/src/index.tsx	Fetches config on init; skips product registration if UI disabled
server/plugin_test.go	Tests for auth, default value, and enabled value on config endpoint
plugin.json	Declares the EnableUI setting with help text
docs/api.md	Documents the new /config endpoint

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