fix: jperldoc now finds perlfunc, perlop and other core documentation

[fglock]

Summary

• Import Perl 5 core pod documentation (perlfunc.pod, perlop.pod, perlre.pod, etc.) into the bundled JAR
• Update build.gradle to include .pod files as resources
• Fix Pod::Perldoc to search both pod/ and Pod/ directories (JAR paths are case-sensitive)
• Add pod directory to the import-perl5 sync configuration

Problem

jperldoc perlfunc and jperldoc perlop were returning "No documentation found" because:

1. The pod files weren't bundled in the JAR
2. Even when bundled, JAR paths are case-sensitive and Perl's perldoc searches for pod/ (lowercase) while macOS creates Pod/ (capitalized)

Solution

1. Added **/*.pod pattern to build.gradle resource configuration
2. Modified Pod::Perldoc.pm searchfor function to also try Pod/ (capitalized) directory
3. Imported ~190 pod documentation files from perl5/pod

Testing

# Before fix:
./jperldoc perlfunc
# -> No documentation found for "perlfunc".

# After fix:
./jperldoc perlfunc
# -> Shows perlfunc documentation

./jperldoc perlop
# -> Shows perlop documentation

./jperldoc perlre
# -> Shows perlre documentation

./jperldoc File::Basename
# -> Module documentation still works

Test plan

• make passes (builds and runs unit tests)
• ./jperldoc perlfunc shows documentation
• ./jperldoc perlop shows documentation
• ./jperldoc File::Basename still works (module docs)

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