Add Altair keyboard with vnz keymap

[vnz]

Summary

Initial setup for ai03 Altair (5-row, 64-key split ergonomic keyboard).

Altair Specs

Spec	Value
Designer	ai03 Design Studio
Keys	64 (5 rows × 7 cols per side + 4 thumb keys)
MCU	RP2040
Layout	Split ergonomic with inner symbol columns

Current State

• Create vnz keymap with default layout
• Port Better-Shift to Lower layer
• Port French accents to Raise layer
• Add Adjust layer (Lower+Raise)
• Add vnz.h shared code
• Test compile

Layout Reference

ESC   1     2     3     4     5     -     │ =     6     7     8     9     0     BSPC
CAPS  Q     W     E     R     T     [     │ ]     Y     U     I     O     P     \
LCTL  A     S     D     F     G     (     │ )     H     J     K     L     ;     '
LSFT  Z     X     C     V     B     `     │ PSCR  N     M     ,     .     /     ENT
                  GUI   ALT   L1    SPC   │ SPC   L1    TAB   DEL

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @vnz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the foundational support for the ai03 Altair keyboard within the project. It establishes a new keymap, 'vnz', which provides a default layout for the keyboard's 64 keys across two layers. This initial integration allows for the compilation of firmware for the Altair with a predefined key configuration, setting the stage for future enhancements and custom features as outlined in the PR description.

Highlights

• New Keyboard Support: Initial setup for the ai03 Altair keyboard has been added, including its basic configuration.
• vnz Keymap: A new keymap named 'vnz' has been created for the Altair keyboard, defining its default layout for both base and function layers.
• QMK Configuration Update: The qmk.json file has been updated to register the new 'vnz' keymap for the ai03 Altair keyboard, making it discoverable by the QMK build system.

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[gemini-code-assist]

Code Review

This pull request introduces a new vnz keymap for the ai03/altair keyboard. The implementation includes a base layer and a function layer for navigation and F-keys. The changes look good, but I've found a critical typo in a keycode within keymap.c that will prevent compilation. I've left a specific comment with a suggestion to fix it. Once addressed, the keymap should be ready for further development as outlined in your checklist.