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

test/maps/ingame-shinsoo.json

@@ -0,0 +1,70 @@
+{
+  "_doc": "PARITY-GAP.md §0.1 受控参考帧契约。'待采集' = 需从原 D3D 客户端实测，未落盘前只允许修正确性/管线问题，不接受为匹配这张图做的相机/光照/色调/材质调参。参考图应放到 test/reference/ingame-shinsoo.png。",
+  "reference_image": "test/reference/ingame-shinsoo.png",
+
+  "output": {
+    "resolution": [1920, 1080],
+    "godot_version": "4.7.1.stable",
+    "renderer": "待采集 (Forward+ / Mobile)",
+    "msaa": "待采集",
+    "taa": "待采集",
+    "color_space": "待采集 (sRGB / linear)",
+    "random_seed": 0
+  },
+
+  "map": {
+    "map_id": "OutdoorA1/metin2_map_a1",
+    "confirmed_is_a1": false,
+    "player_global_cm": ["待采集", "待采集", "待采集"],
+    "load_radius_tiles": 1,
+    "visible_tiles": "待采集"
+  },
+
+  "camera": {
+    "yaw_deg": "待采集",
+    "pitch_deg": "待采集",
+    "roll_deg": "待采集",
+    "distance_m": "待采集",
+    "height_m": "待采集",
+    "fov_deg": "待采集",
+    "near": "待采集",
+    "far": "待采集"
+  },
+
+  "player": {
+    "race": "待采集",
+    "sex": "待采集",
+    "body_gr2": "待采集",
+    "hair_gr2": "待采集",
+    "weapon": "待采集",
+    "equipment": "待采集",
+    "motion": "待采集",
+    "anim_time_s": "待采集"
+  },
+
+  "npc": [],
+
+  "environment": {
+    "msenv": "A1.msenv",
+    "time_of_day": "待采集",
+    "weather": "待采集",
+    "sun_dir": "待采集",
+    "fog": "待采集",
+    "exposure": "待采集",
+    "post": "待采集"
+  },
+
+  "ui": {
+    "locale": "待采集 (截图角标显示 es?)",
+    "inventory_open": "待采集",
+    "minimap_round": "待采集",
+    "chat_lines": ["待采集"],
+    "status_bar": "待采集",
+    "hotbar": "待采集"
+  },
+
+  "excluded_from_frame": [
+    { "item": "完整 .mse 特效", "reason": "目标帧内不可见", "roi": null },
+    { "item": "远离机位的地图内容", "reason": "load_radius 外 / 视锥外", "roi": null }
+  ]
+}