Add installer wireframe docs from Robert's Proksi UX sketches

4-screen wizard flow: welcome/account setup, drive selection with
auto-setup, per-device purpose assignment, network/VPN config.
Accessed via http://proksi.local from a headless live USB boot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/installer-wireframes.md

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+# Installer Wireframes (Proksi UX)
+
+Robert's wireframe sketches for the installer wizard UI.
+
+**Source:** Hand-drawn mockup shared 2026-03-06
+
+## Flow Overview
+
+1. User boots from USB into a **headless live image**
+2. Opens browser, navigates to **http://proksi.local**
+3. Walks through a multi-step wizard (screens below)
+
+---
+
+## Screen 1: Hello (Welcome / Account Setup)
+
+| Field | Notes |
+|-------|-------|
+| Hostname | Name for the server |
+| Username | Info tooltip explaining what this is for |
+| Password | |
+| Password (confirm) | |
+| Backend on/off | Toggle to enable/disable backend |
+| Backend address | Only relevant if backend is on |
+| Language | Language selector |
+
+Navigation: **Next** button (bottom right)
+
+---
+
+## Screen 2: Device Setting (Drive Selection)
+
+Shows detected drives as a selectable list with radio buttons.
+
+| Element | Notes |
+|---------|-------|
+| Boot drive | Select which drive to install the OS on (info tooltip) |
+| Drive list | Radio buttons for each detected drive |
+| Other drives | Remaining drives used as storage |
+| Auto setup | One-click automatic drive assignment |
+
+**Auto setup logic:**
+- Tests drive speeds
+- Fastest drive becomes boot drive
+- Remaining drives become LVM storage
+
+Navigation: **Back** and **Next** buttons
+
+---
+
+## Screen 3: Device Setting (Per-Device Purpose)
+
+Repeats for each additional connected device.
+
+> "We see you have a [device] connected. What is it for?"
+
+- Radio button options for device purpose
+- **"I don't know" (default)** — safe fallback if user is unsure
+
+Navigation: **Back** button, **Next** button (repeats for each device)
+
+---
+
+## Screen 4: Connections (Network)
+
+| Field | Notes |
+|-------|-------|
+| Network settings | IP configuration (DHCP/static) |
+| Connect to a VPN | Optional VPN setup |
+
+*(Wireframe was cut off — likely continues with more options or a summary/confirm screen)*
+
+---
+
+## Design Notes
+
+- Wizard-style step-by-step flow with back/forward navigation
+- Info tooltips (i icons) on fields that need explanation
+- Auto setup reduces decisions for beginners
+- "I don't know" defaults keep things safe for non-technical users
+- Working title for the installer UI: **Proksi**