feat: economy system with minigames, bank, rob, jobs, fishing, blackjack, slots

+ economy domain (EconomyAccount, Job, SlotCombination, EconomyTransaction)
+ EconomyRepository + SqlEconomyRepository + DB schema
+ EconomyService (transfer, daily, deposit/withdraw, stat upgrades)
+ FishingService (fish grid with difficulty levels, speed bonus)
+ BlackjackService (dealer stands on 16, ties lose)
+ SlotService (weighted combos up to x50)
+ JobService (6 jobs with level reqs and efficiency stat)
+ 11 commands: balance, baltop, pay, daily, bank, rob,
  fish, blackjack, slot, job, work
+ Tests for SqlEconomyRepository
+ EconomyModule + EconomyCommandRegistrar wired into BotModule

gradle/libs.versions.toml

@@ -0,0 +1,40 @@
+[versions]
+jda = "5.0.0-beta.20"
+lavaplayer = "2.2.2"
+dotenv = "3.0.0"
+slf4j = "2.0.12"
+logback = "1.5.3"
+gson = "2.10.1"
+caffeine = "3.1.8"
+guice = "7.0.0"
+sqlite = "3.45.1.0"
+hikaricp = "5.1.0"
+junit = "5.10.2"
+mockito = "5.11.0"
+junitPlatformLauncher = "1.10.2"
+checkstyle = "10.21.4"
+spotbugs = "6.1.7"
+spotbugsPlugin = "6.1.7"
+
+[libraries]
+jda = { module = "net.dv8tion:JDA", version.ref = "jda" }
+lavaplayer = { module = "dev.arbjerg:lavaplayer", version.ref = "lavaplayer" }
+dotenv = { module = "io.github.cdimascio:dotenv-java", version.ref = "dotenv" }
+slf4j-api = { module = "org.slf4j:slf4j-api", version.ref = "slf4j" }
+logback-classic = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
+gson = { module = "com.google.code.gson:gson", version.ref = "gson" }
+caffeine = { module = "com.github.ben-manes.caffeine:caffeine", version.ref = "caffeine" }
+guice = { module = "com.google.inject:guice", version.ref = "guice" }
+sqlite-jdbc = { module = "org.xerial:sqlite-jdbc", version.ref = "sqlite" }
+hikaricp = { module = "com.zaxxer:HikariCP", version.ref = "hikaricp" }
+junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit" }
+mockito-core = { module = "org.mockito:mockito-core", version.ref = "mockito" }
+mockito-junit-jupiter = { module = "org.mockito:mockito-junit-jupiter", version.ref = "mockito" }
+junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version.ref = "junitPlatformLauncher" }
+checkstyle = { module = "com.puppycrawl.tools:checkstyle", version.ref = "checkstyle" }
+spotbugs = { module = "com.github.spotbugs:spotbugs", version.ref = "spotbugs" }
+spotbugs-annotations = { module = "com.github.spotbugs:spotbugs-annotations", version.ref = "spotbugs" }
+
+[plugins]
+checkstyle = { id = "checkstyle", version = "" }
+spotbugs = { id = "com.github.spotbugs", version.ref = "spotbugsPlugin" }