feat: 初始化短剧服务端（管理后台 API + 客户端 API）

Spring Boot 3.2 / MyBatis-Plus / PostgreSQL，7 个 Maven 模块；含认证鉴权、内容与媒资管理、操作日志，以及客户端 /app/** 接口。

reelshort-admin-api/pom.xml

@@ -0,0 +1,50 @@
+<?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>com.reelshort</groupId>
+        <artifactId>reelshort</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>reelshort-admin-api</artifactId>
+    <name>reelshort-admin-api</name>
+    <description>管理后台接入层：/admin/**</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.reelshort</groupId>
+            <artifactId>reelshort-module-system</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.reelshort</groupId>
+            <artifactId>reelshort-module-content</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.reelshort</groupId>
+            <artifactId>reelshort-module-media</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>