Chunk ScanAllFactions main loop + toc 120005

[mcc1]

Summary

• 12.0 retail has 400+ factions when SaveHeaders expands all categories. ScanSingleFaction makes 4-5 API calls per entry. The synchronous loop blows WoW's "script ran too long" budget on PLAYER_ALIVE.
• Chunk the main loop into 60 factions per frame, yielding via C_Timer.After(0, ...). RestoreHeaders + lastUpdate run after the last chunk completes (they need to bracket the chunked walk because of header state).
• Generation counter cancels in-flight chunked passes when a fresh ScanAllFactions starts.
• Declare 12.0.5 in toc.

Notes

• The existing 3s debounce in OnUpdateFaction is preserved unchanged - this PR addresses the underlying scan cost, not the trigger frequency.
• ScanGuildReputation is left synchronous (single faction match in a tight loop, cheap).

Test plan

• Log in fresh on 12.0.5 - no script ran too long from DataStore_Reputations.
• After ~1s, /dump DataStore:GetReputationInfo("char", factionID) returns expected data across all categories (including Khaz Algar / Midnight factions previously dropped mid-scan).
• Trigger a rep change via mob kill - debounce + chunked rescan completes cleanly.

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