Add HTTP server settings to the network panel

[MindFreeze]

Proposed change

Adds a form under Settings > System > Network for configuring the HTTP server (port, SSL paths, CORS origins, trusted proxies, IP banning). Backed by the new http/config and http/config/configure WebSocket commands. After save, the user is prompted to restart Home Assistant.

This initial PR only covers the form to change the settings. Will be merged into a feature branch. Handling a good or bad config after a restart of the HTTP server will be done later.

The first commit fixes focus loss in <ha-input-multi>: the existing ${item}-${index} repeat() key destroyed the input element on every keystroke. This wasn't observable before because <ha-form> + text: { multiple: true } is not used anywhere else, and ha-aliases-editor masks it with update-on-blur.
Also had to tweak the margin between the "add" button and the helper text.

Screenshots

Here are all the inputs before I added sections:

Details

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Migrate http: YAML keys into UI configuration elements #51807
• This PR is related to issue or discussion:
• Link to documentation pull request: Update HTTP integration docs for UI configuration home-assistant.io#45302
• Link to developer documentation pull request:
• Link to backend pull request: Move HTTP integration configuration to the UI core#170321 Migrate http config to ui core#171177

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• There is no commented out code in this PR.
• I have followed the perfect PR recommendations
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[Copilot]

Pull request overview

Adds an HTTP server configuration form to the Settings → System → Network panel, backed by new WebSocket endpoints, and includes a small fix to prevent focus loss in multi-value text inputs.

Changes:

• Add a new “HTTP server” card/form in the network config panel for editing HTTP settings and prompting a restart after save.
• Introduce a new src/data/http.ts data module to fetch/update HTTP config via WebSocket.
• Fix <ha-input-multi> list rendering keys to avoid destroying inputs on each keystroke.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/translations/en.json	Adds UI strings for the new HTTP server settings card (labels, helpers, restart prompt).
src/panels/config/network/ha-config-section-network.ts	Inserts the new HTTP settings form into the Network section layout.
src/panels/config/network/ha-config-http-form.ts	Implements the new HTTP settings card, including load/save and restart prompt UI.
src/data/http.ts	Adds WebSocket wrappers (http/config/get, http/config/update) and the HttpConfig type.
src/components/input/ha-input-multi.ts	Updates repeat() keying to prevent focus loss while editing multi-value fields.