Resolve explicit PlatformIO registry type paths in core

[zackees]

Follow-up to #1491. The core resolver now accepts explicit owner/type/name@version and type/owner/name@version registry paths, normalizes PlatformIO package categories, and rejects mismatched requested kinds. This unblocks platform manifest pins such as Apollo3 toolchain-gccarmnoneeabi. Owner-first takes precedence when both tokens look like types, because registry owner names are unrestricted. Offline core tests cover both forms, malformed paths, and the ambiguous owner case.\n\nValidation: soldr cargo test -p fbuild-core --test platformio_package_resolution; soldr cargo clippy --workspace --all-targets -- -D warnings; soldr cargo fmt --all; git diff --check.

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Reviewing files that changed from the base of the PR and between c0ae86e and 674359a.

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• crates/fbuild-core/src/platformio_package.rs
• crates/fbuild-core/tests/platformio_package_resolution.rs

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