fix(bags): restore Forever category icons

[dfrisone]

What does this PR do?

Restores the Gear Enhancements and Professions category icons on the Forever client. The Bags sidebar now resolves category texture IDs through a Forever-only fallback map; Retail retains its original texture IDs.

How was it tested?

• Parsed both changed Lua files with the local Lua interpreter.
• Passed the diff-scoped style gate, whitespace check, and locale-key extraction.
• Verified the active Forever port resolves the same category IDs through the fallback at the sidebar render point.
• In-game verification has not been run.

Screenshots

Missing: no before/after client screenshots were captured.

Checklist

• New settings default OFF (no behavior change without opt-in) - N/A; no setting added
• Zero cost while disabled: no events registered, no polling, no hooks doing work, no frames built - N/A; no feature lifecycle added
• Cheap while enabled: event-driven (no polling, no timer-based logic, no per-frame allocations)
• No writes onto Blizzard-owned frames (weak-table pattern used); HookScript/hooksecurefunc only, never SetScript on Blizzard frames
• Tested in-game on live; no version gates or pre-Midnight APIs added (unverified: Forever client test pending)

[dfrisone]

Reopened against the upstream repo as EllesmereGaming#2134. This one targeted the fork by mistake.