Skip redundant init queries by reading the config blob

[arakashic]

Summary

• Extend Config with manufacturer, keyboard_name, usb, dynamic_keymap, features (parsed from the QMK config blob the app already fetches).
• Drop 5 redundant init queries: QmkBoardIdentifiers, QmkBoardManufacturer, QmkProductName, KeymapGetLayerCount, RemappingGetLayerCount — same values come from the blob.
• Skip the LightingCapabilities query when features.{backlight,rgblight,rgb_matrix,led_matrix} are all false (observed: some boards advertise the Lighting subsystem bit while the build has no lighting features).
• Gate the Encoder tab on features.encoder_map (the dynamic-remap framework) instead of just encoder hardware presence.

Dependencies

Depends on #21 (Encoder Map), which depends on #19 (Keycode pipeline). Merge order: #19 → #21 → this.
The PR diff will shrink to its 5 own commits once both bases land.

Test plan

• cargo build / cargo test / yarn ts-check clean
• On a board with ENCODER_MAP_ENABLE=yes: Encoder tab shows
• On a board with encoders but no encoder_map feature: Encoder tab hidden
• On a board without lighting features: no LightingCapabilities query in logs
• Board ID / manufacturer / product name still display in Info section