feat: port GaC-hkrpg-ps to Go with SceneCastSkill camera-detach fix

- mihoyo-variant KCP in pure Go (28-byte conv+token header), UDP gateway
  with 0xFF/0x145/0x194 handshake, ms-precision KCP clock + retransmit ticker
- protobuf for 4.6.51 generated from the AstralOS StarRail.proto (4932
  messages) plus CmdID map from // CmdID: comments (2114 ids)
- sdkserver port: query_dispatch/query_gateway (Gateserver pb + base64),
  hotfix fetch, auth endpoints, SRTools freesr-data.json upload
- gameserver handlers: login flow, scene load/spawn with real monster
  entity tracking, lineup, avatar/skin, missions, tutorials (1249+855),
  bag/equip, challenge incl. StartChallenge 1787 layout + Tierce 8973 +
  peak 8948, all raw tierce replies
- SceneCastSkill camera bug fix: only real scene monsters (tracked per
  session) trigger battle; attacking props/NPCs/air replies retcode 0
  without battle_info so the camera stays locked on the character
- end-to-end smoke test simulating a client over real UDP: handshake,
  PlayerGetToken, and both SceneCastSkill paths
- reuses the Rust PS data files unchanged (freesr-data.json, persistent,
  res.json, teleports.json, challenge_data.json, mission_unlocks.json)

internal/gameserver/handlers_player.go

@@ -0,0 +1,117 @@
+package gameserver
+
+import (
+	"os"
+
+	goproto "gac-hkrpg-go/protocol/proto"
+)
+
+func init() {
+	// The three optional PlayerSettingInfo sub-messages are required by the
+	// 4.6.51 client: leaving them unset NREs inside _CmdGetBasicInfoScRsp.
+	handle("GetBasicInfo", func(s *Session, req *goproto.GetBasicInfoCsReq, rsp *goproto.GetBasicInfoScRsp) error {
+		rsp.Retcode = 0
+		rsp.Gender = 2
+		rsp.IsGenderSet = true
+		rsp.PlayerSettingInfo = &goproto.PlayerSettingInfo{
+			OJPAODIHAJE: &goproto.PNOLLIAKGDB{
+				BELKCBAGMFC: false,
+				JHJKCJKDHIB: 0,
+				MLPGDPGIFCJ: false,
+			},
+			ANKIDJJINEI: &goproto.LJFJOGEEGPJ{
+				MBIAIMKHNDB: false,
+			},
+			CMFCOOEEECB: &goproto.JPGACKPLGCD{
+				KALACJBAPOA: false,
+				FOKJIPGMKAN: false,
+				IBLGOCFBOCO: false,
+			},
+		}
+		return nil
+	})
+
+	handle("PlayerHeartBeat", func(s *Session, req *goproto.PlayerHeartBeatCsReq, rsp *goproto.PlayerHeartBeatScRsp) error {
+		rsp.ClientTimeMs = req.ClientTimeMs
+		rsp.ServerTimeMs = req.ClientTimeMs
+
+		var finalData []byte
+		finalData = append(finalData, heartbeatLua...)
+		if freecam, err := os.ReadFile("scripts/freecam.lua"); err == nil {
+			finalData = append(finalData, '\n')
+			finalData = append(finalData, freecam...)
+		}
+
+		rsp.DownloadData = &goproto.ClientDownloadData{
+			Version: 51,
+			Time:    int64(rsp.ServerTimeMs),
+			Data:    finalData,
+		}
+		return nil
+	})
+
+	handle("PlayerLoginFinish", func(s *Session, req *goproto.PlayerLoginFinishCsReq, rsp *goproto.PlayerLoginFinishScRsp) error {
+		rsp.Retcode = 0
+
+		notify := &goproto.ContentPackageSyncDataScNotify{
+			Data: &goproto.ContentPackageData{},
+		}
+		for _, v := range contentPackageIDs {
+			notify.Data.ContentPackageList = append(notify.Data.ContentPackageList, &goproto.ContentPackageInfo{
+				Status:    goproto.ContentPackageStatus_ContentPackageStatus_Finished,
+				ContentId: v,
+			})
+		}
+		return s.Send(notify)
+	})
+
+	handle("SyncClientResVersion", func(s *Session, req *goproto.SyncClientResVersionCsReq, rsp *goproto.SyncClientResVersionScRsp) error {
+		rsp.Retcode = 0
+		rsp.LJKMPIMKOMO = req.LJKMPIMKOMO
+		return nil
+	})
+
+	handle("GetPlayerBoardData", func(s *Session, req *goproto.GetPlayerBoardDataCsReq, rsp *goproto.GetPlayerBoardDataScRsp) error {
+		rsp.Retcode = 0
+		rsp.CurrentHeadIconId = 200001
+		rsp.CurrentPersonalCardId = 253001
+		rsp.Signature = "Trailblazer"
+		rsp.JJDDEKIAOFC = []uint32{200001, 200002, 200101, 200102, 200103, 200104}
+		rsp.KJAABDABLJJ = []uint32{253001, 253002}
+		SceneDebugLog("GET_PLAYER_BOARD_DATA sent")
+		return nil
+	})
+
+	handle("GetPhoneData", func(s *Session, req *goproto.GetPhoneDataCsReq, rsp *goproto.GetPhoneDataScRsp) error {
+		rsp.Retcode = 0
+		rsp.CurPhoneTheme = 1
+		rsp.CurPhoneCase = 200001
+		rsp.CurChatBubble = 220001
+		rsp.OwnedPhoneThemes = []uint32{1}
+		rsp.OwnedPhoneCases = []uint32{200001}
+		rsp.OwnedChatBubbles = []uint32{220001}
+		SceneDebugLog("GET_PHONE_DATA sent")
+		return nil
+	})
+}
+
+var contentPackageIDs = []uint32{
+	200001, 200002, 200003, 200004, 200005, 200006, 200007, 200008, 200009, 200010,
+	200011, 200012, 200013, 200014, 150017, 150015, 150021, 150018, 130011, 130012,
+	130013, 150025, 140006, 150026, 130014, 150034, 150029, 150035, 150041, 150039,
+	150045, 150057, 150042, 150067, 150064, 150063, 150024, 171002, 150068, 150070,
+	150071, 150073, 150074, 150075, 150076, 150077, 150078, 150079, 150132, 150134,
+	150135,
+}
+
+const heartbeatLua = `local function beta_text()
+    local gameObject = CS.UnityEngine.GameObject.Find("UIRoot/AboveDialog/BetaHintDialog(Clone)")
+    if gameObject then
+        local textComponent = gameObject:GetComponentInChildren(typeof(CS.RPG.Client.LocalizedText))
+        if textComponent then
+            textComponent.text = "<color=#FF2D00><b>GaC hkrpg GO server</b></color>"
+        end
+    end
+end
+beta_text()
+`