Update onboarding docs for new Welcome/Model/Access/Ready flow

[ronaldmannak]

Summary

Keeps the Install and Run getting-started page in sync with the onboarding rework merged in ronaldmannak/PicoServer since the last documentation run. All facts are grounded in the current source (OnboardingWizardView.swift, MenuExtraView.swift), not point-in-time PR descriptions.

What changed

• Onboarding is now a four-step wizard — Welcome → Model → Access → Ready (PicoServer #42, #48). Rewrote step 2 to describe the actual flow.
• Model step — documents the RAM-based recommended model (preselected), the choice to download / pick another / skip, and that a download continues in the background (PicoServer #38).
• Access step — documents This Mac only vs Devices on my local network, with Bonjour discovery as a nested option shown only when LAN access is on. Updated the LAN / local-only steps to name these choices.
• Removed the stale claim that onboarding sets Open at login and Prevent sleep. The reduced flow (#42) no longer exposes those; the page now notes they live in the native app settings.
• Ready step + menu extra — documents the Ready page's live status/model/access/address display, the download-progress hand-off, and the menu extra's Memory section (Apps / MLX / Free bar + pressure indicator) and Models in Memory list.

Evidence

$ python3 .claude/skills/write-software-docs/scripts/check_markdown.py --strict \
    docs/user-guide/getting-started/install-and-run-pico-ai-server.md
Checked 1 file(s): 0 error(s), 0 warning(s)

Verified against ronaldmannak/PicoServer main at the #49 merge (9088e48): the wizard's WizardPage set (welcome/models/access/ready), AccessPage's two options + nested Bonjour toggle, ReadyPage's status/model/access/address rows, and MenuExtraView's Memory and Models in Memory sections.

Not done on purpose

• PicoServer #34 (menu-extra "Inference" section) — not documented. In release builds inferenceProvider is nil, so the Inference section never renders for end users (the source comment: "Release builds keep this nil so the Inference section never shows fabricated numbers"). Documenting a DEBUG-only, placeholder-data section would be inaccurate; deferred until it ships in release.
• PicoCore #54 (Reasoning-tier rename / RAM tier catalog) — not enumerated. The Model step already documents the RAM-based recommendation generically; specific tier names/model IDs are still in flux (the prior run's PR Document onboarding notifications toggle and menu-extra memory section #5 flagged the same), so naming them now would risk going stale.
• PicoServer #49 (conversation store kept out of the shared app group, in-memory for now) and PicoCore #65/#53/#51 — internal/durability/wire-format changes with no user-, admin-, or developer-facing surface. Nothing to document.
• No developer-facing (API/reference) changes: no endpoint or API-shape changes landed in the window, and PicoDocs had no merged PRs.

Relationship to other open documentation PRs

• PR Document onboarding notifications toggle and menu-extra memory section #5 (onboarding notification toggle + memory section) predates the #42 onboarding reduction and documents a Customize page with an Allow notifications toggle that no longer exists — notification permission is now requested implicitly at first server start, not via an onboarding toggle. This PR supersedes that onboarding content; Document onboarding notifications toggle and menu-extra memory section #5's onboarding portion should be closed or reconciled, and its memory-section content is subsumed here.
• PR Document connecting external MCP servers #4 (external MCP servers) is unrelated and independently valid.

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