fix(repo): detect silent save failures + partial daily mission stubs

SaveColumn and SaveMercenary now check RowsAffected() and return a
wrapped ErrCharacterNotFound when 0 rows are updated, preventing
silent data loss when a character ID is missing or mismatched.
AdjustInt already detects this via its RETURNING scan — no change.

Daily mission packet structs (Get/SetDailyMission*) now parse the
AckHandle instead of returning NOT IMPLEMENTED, letting handlers
send empty-list success ACKs and avoiding client softlocks.

Also adds tests for dashboard stats endpoint and for five guild
repo methods (SetAllianceRecruiting, RolloverDailyRP,
AddWeeklyBonusUsers, InsertKillLog, ClearTreasureHunt) that
had no coverage.

network/mhfpacket/msg_parse_small_test.go

@@ -22,8 +22,6 @@ func TestParseSmallNotImplemented(t *testing.T) {
 		{"MsgMhfEnterTournamentQuest", &MsgMhfEnterTournamentQuest{}},
 		{"MsgMhfGetCaAchievementHist", &MsgMhfGetCaAchievementHist{}},
 		{"MsgMhfGetCaUniqueID", &MsgMhfGetCaUniqueID{}},
-		{"MsgMhfGetDailyMissionMaster", &MsgMhfGetDailyMissionMaster{}},
-		{"MsgMhfGetDailyMissionPersonal", &MsgMhfGetDailyMissionPersonal{}},
 		{"MsgMhfGetRestrictionEvent", &MsgMhfGetRestrictionEvent{}},
 		{"MsgMhfKickExportForce", &MsgMhfKickExportForce{}},
 		{"MsgMhfPaymentAchievement", &MsgMhfPaymentAchievement{}},
@@ -32,7 +30,6 @@ func TestParseSmallNotImplemented(t *testing.T) {
 		{"MsgMhfResetAchievement", &MsgMhfResetAchievement{}},
 		{"MsgMhfResetTitle", &MsgMhfResetTitle{}},
 		{"MsgMhfSetCaAchievement", &MsgMhfSetCaAchievement{}},
-		{"MsgMhfSetDailyMissionPersonal", &MsgMhfSetDailyMissionPersonal{}},
 		{"MsgMhfSetUdTacticsFollower", &MsgMhfSetUdTacticsFollower{}},
 		{"MsgMhfStampcardPrize", &MsgMhfStampcardPrize{}},
 		{"MsgMhfUpdateForceGuildRank", &MsgMhfUpdateForceGuildRank{}},