refactor: consolidate landlords-common into landlords-server

- Move all 11 common sub-packages (channel, entity, enums, exception,
  features, handler, helper, print, robot, transfer, utils) into
  landlords-server/src/main/java with git mv (history preserved).
- Move common test sources (helper, robot) into landlords-server/src/test.
- Move protoc-resource (.proto files + generate.sh) into
  landlords-server/src/main/resources/proto/ for future proto-over-WS use.
- Delete landlords-common/ and protoc-resource/ dirs.
- Drop landlords-common module from root pom.xml.
- Drop landlords-common dependency from landlords-server/pom.xml.
- Simplify Dockerfile COPY lines (only server/ remains).

landlords-common/pom.xml

@@ -1,16 +0,0 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	
-	<modelVersion>4.0.0</modelVersion>
-	<artifactId>landlords-common</artifactId>
-	<name>landlords-common</name>
-	<description>This is a console version of the fight landlord game</description>
-
-	<parent>
-		<groupId>com.smallnico.ratel</groupId>
-		<artifactId>landlords</artifactId>
-		<version>1.4.0</version>
-	</parent>
-	
-</project>

landlords-server/Dockerfile

@@ -2,15 +2,12 @@
 FROM maven:3.9-eclipse-temurin-21 AS build
 WORKDIR /build
 
-# Copy parent pom and all module poms first for dependency caching
+# Copy parent pom and server module pom first for dependency caching
 COPY pom.xml .
-COPY landlords-common/pom.xml landlords-common/
 COPY landlords-server/pom.xml landlords-server/
 
-# Copy sources (common + server)
-COPY landlords-common/src landlords-common/src
+# Copy sources
 COPY landlords-server/src landlords-server/src
-COPY protoc-resource protoc-resource
 
 RUN mvn -B -pl landlords-server -am clean package -DskipTests
 

landlords-server/pom.xml

@@ -17,11 +17,6 @@
 	</properties>
 
 	<dependencies>
-		<dependency>
-			<groupId>com.smallnico.ratel</groupId>
-			<artifactId>landlords-common</artifactId>
-			<version>1.4.0</version>
-		</dependency>
 	</dependencies>
 
 	<build>

pom.xml

@@ -94,7 +94,6 @@
 
 	<modules>
 		<module>landlords-server</module>
-		<module>landlords-common</module>
 	</modules>