Implement first profession quests

[pmbstyle]

Summary

Implements all 18 C4 first-profession quests (Q401-Q418) for Human, Elf, Dark Elf, Orc, and Dwarf characters.

• Adds source-backed quest items, NPC dialogue flows, drop conditions, rewards, and profession completion.
• Adds quest-owned dynamic NPC spawns and C4 radar waypoints where a quest requires them.
• Adds Cat's Eye Bandit world spawns for Path to Rogue.
• Routes successful final hand-ins through the shared class-transfer flow, including skill, stat, and client refreshes.
• Keeps unsupported quest routes out of the active registry following the available-route audit.
• Fixes retrying the Path to Elven Oracle encounter and enforces the source trophy split for Path to Monk.

Validation

• node tests/test_quest_runtime.js
• node tests/test_quest_availability.js
• node tests/test_quest_spawn_radar.js
• node tests/test_change_class.js