[Restore] Reintroduce SSH connections and ACP support

[phinaldoo]

Ported from phinaldoo/chatui#1006 and adapted to Omlorix's current repository layout and branding.

Purpose

This draft preserves SSH connections and ACP support so they can be restored and developed later.

Contents

• restores the complete SSH connection backend, transport, terminal UI, persistence, policy, and import/export integration
• restores the complete ACP provider/runtime/session/permission stack and frontend workflow
• restores related schema, dependencies, translations, tests, documentation, and vendored xterm assets

Relationship to the source removal PR

The source PR was stacked on remove-ssh-acp-support. Omlorix main already omits this functionality, so this adapted restoration targets main directly.

Porting note

The implementation was adapted to Omlorix's refactored chat, split-screen, admin, and provider modules and to current Omlorix branding. The source repository's removed data-governance subsystem was not reintroduced.

Port validation

• node --test frontend/js/chat/acpModelSelect.test.js frontend/js/chat/splitScreen.acp.test.js frontend/js/chat/sshTerminal.test.js frontend/js/chat/workspaceRemoteConnections.test.js frontend/js/chat/workspaceConnections.test.js frontend/js/chat/workspaceCreateEditForms.test.js frontend/js/chat/workspaceConnectionPolicy.test.js — 65 passed
• Python compilation passed for changed Python files.
• node --check passed for changed JavaScript files.
• Locale JSON validation and git diff --check passed.
• Backend pytest was not available in the isolated porting environment.

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