feat(cli): expose deterministic schema CRC

[RainLib]

What changed

• Embed every schemas/help/**/*.json file into the Rust binary at build time.
• Canonicalize names to lowercase schemas/help/... paths with / separators and sort them deterministically.
• Compute the C#-compatible CRC32 stream: canonical path bytes followed by each file's raw bytes.
• Add exact one-argument early dispatch for officecli --output-schema-crc.
• Add algorithm and real CLI regression tests, plus update the durable parity ledger.

Why

Downstream automation needs a stable fingerprint to decide whether the documented property surface changed between binary versions. Rust previously rejected the C# compatibility flag and did not embed the help schema tree.

Validation

• Actual output: fbbccda7
• Standard CRC32 check vector (123456789 → cbf43926)
• Canonical path separator/case and ordering tests
• Filename contribution test
• Repeated real CLI invocation test
• cargo fmt -- --check
• cargo clippy --all-targets -- -D warnings
• cargo test --workspace

Review stack

This PR targets feature/pptx-slide-removal-parity only because that branch introduces the durable parity ledger. The code change is format-independent and contains neither XLSX nor PPTX group-resize changes. Retarget it to main after PR #13 merges.

[RainLib]

验证完成：

• cargo fmt -- --check：通过
• cargo clippy --all-targets -- -D warnings：通过
• cargo test --workspace：通过
• CLI smoke：--output-schema-crc 连续输出稳定，结果为 fbbccda7
• 独立 Build & Release 工作流：Lint/Test 与 7 个发布目标全部通过

CI: https://github.com/RainLib/OfficeCli-rust/actions/runs/29793787829

唯一注解是 actions/cache@v4 的 Node.js 20 弃用警告，不影响本 PR 的构建与验证结果。