feat(generator): improve jump generation and block placement logic

Refactor the parkour generator to improve jump accuracy, block placement, and lifecycle management.

- Improve jump calculation by normalizing heading vectors and adjusting height/distance constraints.
- Implement height overrides for tall materials (fences, trapdoors, glass panes) during block placement.
- Add difficulty-based special block generation (packed/blue ice).
- Fix block identity issues by using coordinate-based comparison instead of reference equality for scoring and cleanup.
- Optimize generation lead to reduce unnecessary block generation.
- Update leaderboard logic to only replace scores if the new score is strictly better (higher score or faster time).
- Add error handling for generator ticks to prevent session crashes.

build: update build configuration and dependencies

- Add `run-paper` plugin for easier local server testing.
- Update Gradle wrapper to version 8.14.3.
- Change WorldEdit dependencies to `compileOnly`.
- Configure `runServer` task with Minecraft 1.21.4 and PlaceholderAPI.

fix(ui): improve scoreboard placeholder handling

- Add check for PlaceholderAPI plugin enablement before attempting to use it.

build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     id("java")
     id("io.github.goooler.shadow") version("8.1.8")
+    id("xyz.jpenilla.run-paper") version("3.0.2")
 }
 
 group = "dev.loki"
@@ -90,8 +91,8 @@ dependencies {
     implementation("org.bstats:bstats-bukkit:3.2.1")
     implementation("com.zaxxer:HikariCP:5.1.0")
     implementation("com.mysql:mysql-connector-j:8.3.0")
-    implementation("com.sk89q.worldedit:worldedit-core:7.3.6")
-    implementation("com.sk89q.worldedit:worldedit-bukkit:7.3.6")
+    compileOnly("com.sk89q.worldedit:worldedit-core:7.3.6")
+    compileOnly("com.sk89q.worldedit:worldedit-bukkit:7.3.6")
 
     // Provided dependencies (plugins)
     compileOnly("me.clip:placeholderapi:2.11.6")
@@ -119,8 +120,6 @@ tasks.shadowJar {
     relocate("io.papermc.lib", "dev.loki.loparkour.lib.paperlib")
     relocate("com.google.gson", "dev.loki.loparkour.lib.gson")
     relocate("org.bstats", "dev.loki.loparkour.lib.bstats")
-    relocate("com.sk89q.worldedit", "dev.loki.loparkour.lib.worldedit")
-    relocate("org.enginehub", "dev.loki.loparkour.lib.enginehub")
 
     // Don't minimize - causes issues with Caffeine's dynamically generated classes
     // minimize {
@@ -156,5 +155,18 @@ tasks.withType<Javadoc> {
     options.encoding = "UTF-8"
 }
 
+// Run paper server via gradlew runServer
+tasks {
+    runServer {
+        minecraftVersion("1.21.4")
+        jvmArgs("-Xms2G", "-Xmx2G")
+        runDirectory.set(layout.projectDirectory.dir("run"))
+
+        downloadPlugins {
+            modrinth("placeholderapi", "2.11.6")
+        }
+    }
+}
+
 // Default task
 defaultTasks("clean", "build")