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

config/checkstyle/checkstyle.xml

@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE module PUBLIC
+    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+    "https://checkstyle.org/dtds/configuration_1_3.dtd">
+<module name="Checker">
+    <property name="charset" value="UTF-8"/>
+    <property name="severity" value="error"/>
+    <property name="fileExtensions" value="java"/>
+
+    <module name="BeforeExecutionExclusionFileFilter">
+        <property name="fileNamePattern" value="module\-info\.java$"/>
+    </module>
+
+    <module name="FileTabCharacter">
+        <property name="eachLine" value="true"/>
+    </module>
+
+    <module name="LineLength">
+        <property name="max" value="150"/>
+        <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
+    </module>
+
+    <module name="RegexpSingleline">
+        <property name="format" value="\s+$"/>
+        <property name="message" value="Line has trailing whitespace."/>
+    </module>
+
+    <module name="TreeWalker">
+        <module name="PackageName">
+            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
+        </module>
+
+        <module name="TypeName">
+            <property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, ANNOTATION_DEF, RECORD_DEF"/>
+            <property name="format" value="^[A-Z][a-zA-Z0-9]*$"/>
+        </module>
+
+        <module name="MethodName">
+            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+        </module>
+
+        <module name="ConstantName">
+            <property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$|^logger$|^LOGGER$"/>
+        </module>
+
+        <module name="LocalVariableName">
+            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+            <property name="allowOneCharVarInForLoop" value="true"/>
+        </module>
+
+        <module name="MemberName">
+            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+        </module>
+
+        <module name="ParameterName">
+            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+        </module>
+
+        <module name="LambdaParameterName">
+            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+        </module>
+
+        <module name="LeftCurly">
+            <property name="option" value="eol"/>
+        </module>
+
+        <module name="RightCurly">
+            <property name="option" value="same"/>
+        </module>
+
+        <module name="WhitespaceAround">
+            <property name="allowEmptyConstructors" value="true"/>
+            <property name="allowEmptyMethods" value="true"/>
+            <property name="allowEmptyTypes" value="true"/>
+            <property name="allowEmptyLoops" value="true"/>
+        </module>
+
+        <module name="NoWhitespaceAfter"/>
+        <module name="NoWhitespaceBefore"/>
+
+        <module name="Indentation">
+            <property name="basicOffset" value="4"/>
+            <property name="braceAdjustment" value="0"/>
+            <property name="caseIndent" value="4"/>
+            <property name="throwsIndent" value="4"/>
+            <property name="lineWrappingIndentation" value="4"/>
+            <property name="arrayInitIndent" value="4"/>
+        </module>
+    </module>
+</module>

config/spotbugs/exclude.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FindBugsFilter
+    xmlns="https://github.com/spotbugs/filter"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="https://github.com/spotbugs/filter https://raw.githubusercontent.com/spotbugs/spotbugs/7.0.0/spotbugs/etc/findbugsfilter.xsd">
+</FindBugsFilter>