Changes proposed:

• Implement character_background_filters DB table and prepared statements to persist per-character selfie background filter unlocks
• Implement spell scripts for the S.E.L.F.I.E. Camera MkII (spell_item_selfie_camera_mk2), background filter cycling (spell_gen_background_filter), selfie camera filters (spell_gen_selfie_camera_filter), and taking selfies near boss NPCs to complete quests (spell_gen_take_selfie)
• Add quest templates and spell script name entries for the five background filter quests (Frostmourne, Firelands, Argus, Sha, Twilight)

Issues addressed:
None

Tests performed:

• Verify DB migration applies cleanly (characters and world SQL)
• Test equipping S.E.L.F.I.E. Camera MkII applies and removes the active background filter aura correctly
• Test background filter cycling increments/resets index properly
• Test taking a selfie near each of the five boss NPCs (Lich King, Ragnaros, Argus, Sha of Fear, Cho'gall) completes the corresponding quest and awards the filter spell
• Confirm filter unlock persists across relog

Known issues and TODO list:

• Implement background filter quests
• Implement selfie camera aura
• spell_gen_selfie_camera_filter::HandleDummy - quest logic not yet implemented for Sketch Filter (181767), Death Filter (181779), and Black and White Filter (181773)
• spell_gen_take_selfie::SetDest - destination targeting for TARGET_UNIT_CONE_CASTER_TO_DEST_ENTRY not yet implemented (marked TODO in code)
• Unhandled spell 342460 [DNT] Steward Selfie
• broadcast_text - 141931, 141932, 141933, 141934, 141935