refactor(channelserver): migrate inline queries to helpers and define named constants

Migrate 6 character data handlers to use the existing loadCharacterData
and saveCharacterData helpers, eliminating duplicate inline SQL:
- LoadFavoriteQuest, SaveFavoriteQuest, LoadDecoMyset, LoadMezfesData,
  LoadHunterNavi, GetEquipSkinHist

Define named constants replacing magic numbers across handlers:
- Achievement trophy tiers, broadcast/message types, diva phase
  durations, RP accrual rates, kill log layout, semaphore bases,
  quest stage/loading screen IDs

Update anti-patterns doc with accurate line counts, evidence-based
softlock analysis, and revised refactoring priorities.

server/channelserver/constants_quest.go

@@ -0,0 +1,62 @@
+package channelserver
+
+// Raviente quest type codes
+const (
+	QuestTypeSpecialTool      = uint8(9)
+	QuestTypeRegularRaviente  = uint8(16)
+	QuestTypeViolentRaviente  = uint8(22)
+	QuestTypeBerserkRaviente  = uint8(40)
+	QuestTypeExtremeRaviente  = uint8(50)
+	QuestTypeSmallBerserkRavi = uint8(51)
+)
+
+// Event quest binary frame offsets
+const (
+	questFrameTimeFlagOffset  = 25
+	questFrameVariant3Offset  = 175
+)
+
+// Quest body lengths per game version
+const (
+	questBodyLenS6   = 160
+	questBodyLenF5   = 168
+	questBodyLenG101 = 192
+	questBodyLenZ1   = 224
+	questBodyLenZZ   = 320
+)
+
+// BackportQuest constants
+const (
+	questRewardTableBase    = uint32(96)
+	questStringPointerOff   = 40
+	questStringTablePadding = 32
+	questStringCount        = 8
+)
+
+// BackportQuest fill lengths per version
+const (
+	questBackportFillS6   = uint32(44)
+	questBackportFillF5   = uint32(52)
+	questBackportFillG101 = uint32(76)
+	questBackportFillZZ   = uint32(108)
+)
+
+// Tune value count limits per game version
+const (
+	tuneLimitG1   = 256
+	tuneLimitG3   = 283
+	tuneLimitGG   = 315
+	tuneLimitG61  = 332
+	tuneLimitG7   = 339
+	tuneLimitG81  = 396
+	tuneLimitG91  = 694
+	tuneLimitG101 = 704
+	tuneLimitZ2   = 750
+	tuneLimitZZ   = 770
+)
+
+// Event quest data size bounds
+const (
+	questDataMaxLen = 896
+	questDataMinLen = 352
+)