feat(client): 完成40250客户端核心功能1:1对齐与桥梁高度采样修复

- 桥梁与静态物体高度采样修复：
  - 严格对齐 40250 CMapOutdoor::GetHeight 与 CAttributeInstance::GetHeight
  - 解析 .mdatr 中的 AttributeHeight 网格，使用 is_in_triangle_2d 准确计算桥面多边形平面方程
  - sample_height 查询邻近区块并返回 fMAX(fObjectHeight, fTerrainHeight)，彻底解决走上桥面穿透掉入水底/河床的问题
  - 新增 test_bridge_height_parity.gd 自动化对拍测试
- 40250 怪物击杀经验动效：
  - 1:1 实现 FLY_EXP(0) / FLY_HP / FLY_SP 粒子轨迹与爆炸吸附
- 40250 客户端全系统功能对齐（Batches 1-31）：
  - 包含公会、交易、骑乘、变身、钓鱼、采矿、商城、信件、结婚、地牢等 134 套对拍系统与自动化回归测试
- 文档沉淀：
  - 新增 docs/CLIENT-PARITY-AUDIT-AND-FIX-GUIDE.md 客户端对拍缺陷发现与修复工程指南

extension/tests/net_classic_session_test.cpp

@@ -228,10 +228,13 @@ int main() {
 		mc.y = 200000;
 		mc.z = 3;
 		mc.empire = 1;
+		mc.skill_group = 2;
 		feed(s, raw(mc));
 		CHECK(s.world().main_vid() == 7777, "main vid set");
 		const auto *me = s.world().get(7777);
 		CHECK(me && me->is_main && me->x == 100000.f && me->name == "Warrior", "main entity");
+		CHECK(s.world().skill_group() == 2, "skill_group propagated to world");
+		CHECK(s.parser().empire() == 1, "empire propagated to parser");
 		auto version = drain(s);
 		// §1.5: EUROPE-family locale sends CG_CLIENT_VERSION2 (0xf1) with the
 		// fixed ymir epoch string; same 67-byte layout as CG_CLIENT_VERSION.
@@ -248,7 +251,7 @@ int main() {
 		add.header = HDR_GC_CHARACTER_ADD;
 		add.vid = 8888;
 		add.race = 101;
-		add.type = CHRTYPE_NPC;
+		add.type = WIRE_CHRTYPE_NPC;
 		add.x = 100500;
 		add.y = 200500;
 		add.moving_speed = 150;
@@ -279,7 +282,7 @@ int main() {
 		mob.header = HDR_GC_CHARACTER_ADD;
 		mob.vid = 8890;
 		mob.race = 101;
-		mob.type = CHRTYPE_MONSTER;
+		mob.type = WIRE_CHRTYPE_MONSTER;
 		mob.x = 101000;
 		mob.y = 201000;
 		feed(s, raw(mob));
@@ -292,7 +295,7 @@ int main() {
 		ghost.header = HDR_GC_CHARACTER_ADD;
 		ghost.vid = 8891;
 		ghost.race = 20025;
-		ghost.type = CHRTYPE_MONSTER;
+		ghost.type = WIRE_CHRTYPE_MONSTER;
 		feed(s, raw(ghost));
 		CHECK(s.world().get(8891) == nullptr && s.parser().pending_actor_count() == 0 &&
 				s.world().size() == 3, "invisible race dropped");