docs: curate public model references

[GreatV]

Summary

• remove experimental and compatibility-only checkpoints from the supported model guide
• link PP-OCRv6 files to the published v0.7.0 assets and keep official PaddleOCR bundle links
• align model names in Markdown and Rust examples with public Release, ModelScope, and official PaddleOCR assets
• simplify headings, remove parenthetical title notes and arrow notation, and keep prose paragraphs on one source line
• fix the documented table-structure example argument

Why

The documentation refresh treated several registry and local conversion artifacts as supported public models. Some example commands also used stale or incorrectly cased filenames that do not match the published assets.

Impact

Users can now follow the model tables and example commands using publicly available files. The supported VLM list and parameter labels remain unchanged after verification against the model authors' public repositories.

Validation

• cargo fmt --all -- --check
• cargo test --workspace
• cargo check --workspace --examples
• verified 93 GitHub Release asset links and 76 displayed asset sizes
• verified official PaddleOCR dictionaries and PP-OCRv6 bundles
• verified 106 concrete model asset names and all listed VLM repositories against public sources

[gemini-code-assist]

Code Review

This pull request standardizes model filenames and paths across documentation and examples to use a consistent lowercase, hyphenated naming convention matching the v0.7.0 release. It also updates documentation links, refactors section headers, and replaces arrow symbols with descriptive text in code comments to improve readability. No review comments were provided, and I have no feedback to offer as the changes are clean and correct.

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