docs: expand CLAUDE.md with complete package structure and install command (#16)

Author: marevol

CLAUDE.md

@@ -8,13 +8,27 @@ Java 21 utility library. Maven build system, Apache License 2.0.
 src/main/java/org/codelibs/core/
 ├── beans/       # Bean manipulation & introspection (converter/, factory/, impl/, util/)
 ├── collection/  # Enhanced collections (LruHashMap, CaseInsensitiveMap)
+├── concurrent/  # Concurrency utilities
 ├── convert/     # Type conversion (*ConversionUtil)
+├── crypto/      # Cipher & encryption (CachedCipher)
 ├── exception/   # Runtime exception wrappers
 ├── io/          # I/O & resource utilities
+├── jar/         # JAR file utilities
 ├── lang/        # Reflection & language utilities
+├── log/         # Logging utilities
+├── message/     # Message resource handling
 ├── misc/        # AssertionUtil, Base64Util, etc.
+├── naming/      # JNDI naming utilities
+├── net/         # Network & URL utilities
+├── nio/         # NIO file utilities
+├── security/    # Security & MessageDigest utilities
+├── sql/         # SQL type utilities
+├── stream/      # Stream utilities
 ├── text/        # Text processing (JSON, Tokenizer)
-└── ...          # Others (crypto, log, net, xml, zip, etc.)
+├── timer/       # Timer utilities
+├── xml/         # XML processing
+├── zip/         # ZIP file utilities
+└── CoreLibConstants.java
 src/test/java/   # Test classes (mirrors main structure)
 ```
 
@@ -24,6 +38,7 @@ src/test/java/   # Test classes (mirrors main structure)
 mvn test                              # Run tests
 mvn test -Dtest=ClassName#methodName  # Run specific test
 mvn clean package                     # Build
+mvn install                           # Install to local Maven repo
 mvn formatter:format                  # Format code
 mvn license:format                    # Apply license headers
 mvn verify                            # Generate coverage report