fix: inspect (packed GUID), follow (client-side auto-walk); add loot/raid commands

Inspect: CMSG_INSPECT was writing full uint64 GUID instead of packed GUID.
Server silently rejected the malformed packet. Fixed both InspectPacket and
QueryInspectAchievementsPacket to use writePackedGuid().

Follow: was a no-op (only stored GUID). Added client-side auto-follow system:
camera controller walks toward followed entity, faces target, cancels on
WASD/mouse input, stops within 3 units, cancels at 40+ units distance.

Party commands:
- /lootmethod (ffa/roundrobin/master/group/nbg) sends CMSG_LOOT_METHOD
- /lootthreshold (0-5 or quality name) sets minimum loot quality
- /raidconvert converts party to raid (leader only)

Equipment diagnostic logging still active for debugging naked players.

src/core/application.cpp

@@ -965,6 +965,11 @@ void Application::setState(AppState newState) {
                         gameHandler->setStandState(0); // CMSG_STAND_STATE_CHANGE(STAND)
                     }
                 });
+                cc->setAutoFollowCancelCallback([this]() {
+                    if (gameHandler) {
+                        gameHandler->cancelFollow();
+                    }
+                });
                 cc->setUseWoWSpeed(true);
             }
             if (gameHandler) {
@@ -983,6 +988,15 @@ void Application::setState(AppState newState) {
                         renderer->getCameraController()->triggerShake(magnitude, frequency, duration);
                     }
                 });
+                gameHandler->setAutoFollowCallback([this](const glm::vec3* renderPos) {
+                    if (renderer && renderer->getCameraController()) {
+                        if (renderPos) {
+                            renderer->getCameraController()->setAutoFollow(renderPos);
+                        } else {
+                            renderer->getCameraController()->cancelAutoFollow();
+                        }
+                    }
+                });
             }
             // Load quest marker models
             loadQuestMarkerModels();