Metin2 game client (P0–P11) + mobile asset pipeline

Networked client on the existing Godot 4.7 + libgr2 renderer:
- net: m2dev wire protocol (libsodium KX + XChaCha20), auth/select/game
  phases, EntityStore world model, ~all GC/CG headers. char create/delete,
  private shop / mall / cube, SHOP_GC_START_EX, guild, party (+ CG_PARTY_SET_STATE),
  quests, dragon soul, refine, safebox, exchange.
- UI: in-game windows migrated 1:1 from the reference uiscript/root .py —
  char status (/stat), inventory+equipment, select-item ([SELECT_ITEM] quest
  token), system-option + game-option + ESC system menu, private-shop 39-grid,
  party info board, shop tabs, atlas, minimap, quickbar, chat, …
- EterGrnLib polish: GR2 material blend/two-sided, LOD crossfade, motion-event
  dispatch, contact shadow, ray-AABB picking, weapon grip pre-transform.

Portable asset IO (A1) — all extension/libgr2/formats/mtproto reads routed
through godot::FileAccess (res:// PCK works on iOS/Android); standalone-lib
*_path() kept for the non-Godot CTests. AssetResolver + PropertyRegistry
switched to a baked index (bake_asset_index.gd) instead of std::filesystem.

Mobile builds: build-{android,ios}.sh, export-android.sh, pack-assets.sh,
gen-debug-keystore.sh. Assets ship as a zip mounted at runtime by
project/asset_pack.gd (adb push now; HTTP download is a drop-in later).

ctest 10/10, 34 GDScript suites, macOS/iOS/Android all build.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013EJxkHiNKS4kybHS3XKyAJ

formats/msa.cpp

@@ -0,0 +1,74 @@
+// M2 T1 —— .msa 解析（照 EterGrnLib/Util.cpp CGrannyMotion::LoadMotionData 的字段）。
+#include "msa.h"
+#include "textscript.h"
+#include <cstdlib>
+
+namespace fmt {
+
+static void vec3(const std::vector<std::string>* l, float* out) {
+    if (!l) return;
+    for (int k = 0; k < 3 && k + 1 < (int)l->size(); ++k) out[k] = float(std::atof((*l)[k + 1].c_str()));
+}
+
+static void loop_data(const Node& root, Msa& out) {
+	if (const Node* loop = root.group("LoopData")) {
+		out.has_loop_data = true;
+		out.motion_loop_count = loop->inum("MotionLoopCount", -1);
+		out.loop_cancel_enable = loop->inum("LoopCancelEnable", 0) != 0;
+		out.loop_start_time = loop->num("LoopStartTime");
+		out.loop_end_time = loop->num("LoopEndTime");
+	}
+}
+
+bool parse_msa(const std::string& text, Msa& out, std::string* err) {
+    Node root;
+    if (!parse_textscript(text, root, err)) return false;
+    out = Msa{};
+
+    out.motion_gr2 = root.str("MotionFileName");
+    out.duration   = root.num("MotionDuration");
+    vec3(root.find("Accumulation"), out.accumulation);
+	loop_data(root, out);
+
+    if (const Node* med = root.group("MotionEventData")) {
+        int count = med->inum("MotionEventDataCount", int(med->groups.size()));
+        (void)count;
+        for (const Node& ev : med->groups) {
+            MotionEvent e;
+            e.type        = ev.inum("MotionEventType");
+            e.start_time  = ev.num("StartingTime");
+            e.effect_file = ev.str("EffectFileName");
+            e.sound_file  = ev.str("SoundFileName");
+            vec3(ev.find("EffectPosition"), e.position);
+            out.events.push_back(std::move(e));
+        }
+    }
+
+    if (out.motion_gr2.empty()) { if (err) *err = "msa: 缺 MotionFileName"; return false; }
+    return true;
+}
+
+bool parse_msa_file(const std::string& path, Msa& out, std::string* err) {
+    Node root;
+    if (!parse_textscript_file(path, root, err)) return false;
+    // 复用上面逻辑：重解析文本更简单，这里直接从 root 走一遍
+    out = Msa{};
+    out.motion_gr2 = root.str("MotionFileName");
+    out.duration   = root.num("MotionDuration");
+    vec3(root.find("Accumulation"), out.accumulation);
+	loop_data(root, out);
+    if (const Node* med = root.group("MotionEventData"))
+        for (const Node& ev : med->groups) {
+            MotionEvent e;
+            e.type = ev.inum("MotionEventType");
+            e.start_time = ev.num("StartingTime");
+            e.effect_file = ev.str("EffectFileName");
+            e.sound_file = ev.str("SoundFileName");
+            vec3(ev.find("EffectPosition"), e.position);
+            out.events.push_back(std::move(e));
+        }
+    if (out.motion_gr2.empty()) { if (err) *err = "msa: 缺 MotionFileName (" + path + ")"; return false; }
+    return true;
+}
+
+} // namespace fmt