v0.9.5 - model settings UX refresh

What's changed

• Refreshes the web model settings editor with unified create/edit behavior and more polished settings rows.
• Improves model discovery, manual model fallback handling, connection testing, and advanced prompt/request-body fields.
• Updates the admin models list with search, clearer row layout, enabled controls, health checks, and explicit edit/delete actions.
• Improves the compact web chat model picker with search for larger model lists and better selected/loading/empty states.

Validation

• Web E2E smoke passed on main, dev, and v0.9.5.
• App image published successfully for ghcr.io/yoloyash/overtchat-app:0.9.5 and latest.