feat(w1): maven skeleton + CI scaffold

- Parent POM: de.platesoft:plate-auth-parent with ${revision} CI-friendly versioning
- plate-auth-starter module: Spring Boot 4.1.0 starter deps (web, jpa, security, validation, jwt, flyway, envers)
- @platesoft/auth npm package skeleton: tsup bundler, conditional exports, TypeScript strict
- Gitea Actions: ci.yml (on push/PR) + release.yml (on v* tag)
- distributionManagement pointing to Gitea Package Registry (Maven + npm)
- Apache-2.0 LICENSE, README with quickstart, CHANGELOG, .editorconfig, .gitignore
- pnpm workspace with packages/auth
- Maven BUILD SUCCESS verified locally

pom.xml

@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>4.1.0</version>
+        <relativePath/>
+    </parent>
+
+    <groupId>de.platesoft</groupId>
+    <artifactId>plate-auth-parent</artifactId>
+    <version>${revision}</version>
+    <packaging>pom</packaging>
+
+    <name>plate-auth</name>
+    <description>Reusable auth + multi-tenancy starter for Spring Boot 4 + NextAuth v5</description>
+    <url>https://git.plate-software.de/pplate/plate-auth</url>
+
+    <licenses>
+        <license>
+            <name>Apache License, Version 2.0</name>
+            <url>https://www.apache.org/licenses/LICENSE-2.0</url>
+        </license>
+    </licenses>
+
+    <properties>
+        <revision>0.1.0-SNAPSHOT</revision>
+        <java.version>25</java.version>
+        <jjwt.version>0.12.6</jjwt.version>
+        <testcontainers.version>1.20.4</testcontainers.version>
+    </properties>
+
+    <modules>
+        <module>plate-auth-starter</module>
+    </modules>
+
+    <distributionManagement>
+        <repository>
+            <id>gitea</id>
+            <url>https://git.plate-software.de/api/packages/pplate/maven</url>
+        </repository>
+        <snapshotRepository>
+            <id>gitea</id>
+            <url>https://git.plate-software.de/api/packages/pplate/maven</url>
+        </snapshotRepository>
+    </distributionManagement>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>flatten-maven-plugin</artifactId>
+                <version>1.6.0</version>
+                <configuration>
+                    <updatePomFile>true</updatePomFile>
+                    <flattenMode>resolveCiFriendliesOnly</flattenMode>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>flatten</id>
+                        <phase>process-resources</phase>
+                        <goals><goal>flatten</goal></goals>
+                    </execution>
+                    <execution>
+                        <id>flatten.clean</id>
+                        <phase>clean</phase>
+                        <goals><goal>clean</goal></goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>