feat: 完成L09统一文档解析模块与MinerU PDF Provider接入

- 新增 easy-agents-document 聚合、document-core 与 document-pdf 模块

- 接入 MinerU PDF provider，支持同步解析、异步任务与 ZIP 结果映射

- 移除 easy-agents-rag-ocr 空壳并补齐 starter 自动装配

easy-agents-document/easy-agents-document-core/pom.xml

@@ -0,0 +1,28 @@
+<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.easyagents</groupId>
+        <artifactId>easy-agents-document</artifactId>
+        <version>${revision}</version>
+    </parent>
+
+    <artifactId>easy-agents-document-core</artifactId>
+    <name>easy-agents-document-core</name>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.easyagents</groupId>
+            <artifactId>easy-agents-core</artifactId>
+        </dependency>
+    </dependencies>
+</project>