feat: enhance physics and map modules with Box2D integration and documentation updates

- Updated the physics module to include Box2D support, enabling management of physics bodies and collision events.
- Enhanced the map module to support tile layers and improved hot-reload functionality for tilemaps.
- Updated documentation to reflect the new features in the physics and map systems, including usage examples and API references.
- Modified CMakeLists.txt to include new modules for physics and font management, ensuring proper build configurations.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/modules/physics/Fixture.cpp

@@ -0,0 +1,72 @@
+#include "physics/Fixture.h"
+#include "physics/Body.h"
+#include "physics/World.h"
+
+#include <Box2D/Box2D.h>
+
+namespace eve::physics {
+
+Fixture::Fixture(World *world, Body *body, b2Fixture *fixture)
+    : world_(world), body_(body), fixture_(fixture) {}
+
+Fixture::~Fixture() {
+    if (fixture_ && body_ && body_->raw()) {
+        fixture_->SetUserData(nullptr);
+        body_->raw()->DestroyFixture(fixture_);
+        if (world_) world_->forgetFixture(this);
+    }
+    fixture_ = nullptr;
+    body_    = nullptr;
+    world_   = nullptr;
+}
+
+void Fixture::invalidate() {
+    if (fixture_) fixture_->SetUserData(nullptr);
+    fixture_ = nullptr;
+    body_    = nullptr;
+    world_   = nullptr;
+}
+
+void Fixture::destroy() {
+    if (!fixture_ || !body_ || !body_->raw()) {
+        invalidate();
+        return;
+    }
+    fixture_->SetUserData(nullptr);
+    body_->raw()->DestroyFixture(fixture_);
+    if (world_) world_->forgetFixture(this);
+    fixture_ = nullptr;
+    body_    = nullptr;
+    world_   = nullptr;
+}
+
+void Fixture::setSensor(bool sensor) {
+    if (!fixture_) return;
+    fixture_->SetSensor(sensor);
+}
+
+bool Fixture::isSensor() const { return fixture_ ? fixture_->IsSensor() : false; }
+
+void Fixture::setFriction(float friction) {
+    if (!fixture_) return;
+    fixture_->SetFriction(friction);
+}
+
+float Fixture::getFriction() const { return fixture_ ? fixture_->GetFriction() : 0.f; }
+
+void Fixture::setRestitution(float restitution) {
+    if (!fixture_) return;
+    fixture_->SetRestitution(restitution);
+}
+
+float Fixture::getRestitution() const { return fixture_ ? fixture_->GetRestitution() : 0.f; }
+
+void Fixture::setDensity(float density) {
+    if (!fixture_) return;
+    fixture_->SetDensity(density);
+    if (body_ && body_->raw()) body_->raw()->ResetMassData();
+}
+
+float Fixture::getDensity() const { return fixture_ ? fixture_->GetDensity() : 0.f; }
+
+}  // namespace eve::physics