chore: initial commit - LoMines v3.0.0 base structure

- Java rewrite from Kotlin
- LoAPI 3.0.0 integration
- Paper 1.21 support
- Core mine system with handlers
- BlockSetter abstraction (Bukkit/Oraxen/ItemsAdder)
- Statistics and leaderboard system
- Group wand for batch mine creation
- Mask fill mode support

Known issues:
- ConfigLoader.java: 712 lines (needs refactoring)
- MineCommands.java: 341 lines (needs splitting)
- 7 classes exceed 200 line limit
- Code quality improvements needed (KISS, DRY, SOLID)

build.gradle.kts

@@ -0,0 +1,88 @@
+plugins {
+    java
+    id("com.github.johnrengelman.shadow") version "8.1.1"
+}
+
+group = "com.loki"
+version = "3.0.0"
+description = "Multi-region mine management plugin for Paper"
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
+}
+
+repositories {
+    mavenCentral()
+    maven("https://repo.papermc.io/repository/maven-public/")
+    maven("https://jitpack.io")
+}
+
+// LoAPI: libs/lolib*.jar — fileTree индексируется Gradle / Java LS стабильнее, чем files(singleJar)
+val lolibTree = fileTree("libs") { include("lolib*.jar") }
+if (lolibTree.files.isEmpty()) {
+    throw GradleException(
+        "Missing libs/lolib*.jar — add LoAPI fat jar to ${rootProject.file("libs").absolutePath}"
+    )
+}
+
+dependencies {
+    // Paper API 1.21
+    compileOnly("io.papermc.paper:paper-api:1.21-R0.1-SNAPSHOT")
+    
+    // LoAPI (local)
+    implementation(lolibTree)
+    
+    // Runtime dependencies (loaded via DependencyManager from LoAPI)
+    // These are marked as compileOnly because they will be downloaded at runtime
+    compileOnly("org.apache.commons:commons-math3:3.6.1")
+    compileOnly("commons-io:commons-io:2.17.0")
+    
+    // Optional plugin integrations (soft dependencies)
+    compileOnly("com.github.oraxen:oraxen:1.171.0")
+    compileOnly("com.github.LoneDev6:api-itemsadder:3.6.1")
+    
+    // Test dependencies
+    testImplementation("org.junit.jupiter:junit-jupiter:5.10.0")
+    testImplementation("io.kotest:kotest-runner-junit5:5.7.2")
+    testImplementation("io.kotest:kotest-assertions-core:5.7.2")
+    testImplementation("io.kotest:kotest-property:5.7.2")
+    testImplementation("org.mockito:mockito-core:5.7.0")
+    testImplementation("org.mockito:mockito-inline:5.2.0")
+    testImplementation("io.papermc.paper:paper-api:1.21-R0.1-SNAPSHOT")
+    testImplementation("org.apache.commons:commons-math3:3.6.1")
+    testImplementation("commons-io:commons-io:2.17.0")
+}
+
+tasks {
+    shadowJar {
+        archiveClassifier.set("")
+        
+        // Relocate LoAPI to avoid conflicts
+        relocate("dev.lolib", "com.loki.lomines.libs.lolib")
+        
+        // Don't minimize - causes issues with Java 21
+        // minimize()
+    }
+    
+    build {
+        dependsOn(shadowJar)
+    }
+    
+    test {
+        useJUnitPlatform()
+    }
+    
+    processResources {
+        val props = mapOf(
+            "version" to version,
+            "description" to description
+        )
+        inputs.properties(props)
+        filteringCharset = "UTF-8"
+        filesMatching("plugin.yml") {
+            expand(props)
+        }
+    }
+}