release mp4forge 0.7.0

[bakgio]

Summary

• bump mp4forge to 0.7.0
• update release-facing docs and templates for the new version
• add the 0.7.0 changelog entry covering the decryption work that landed on this branch

Included In 0.7.0

• feature-gated decryption APIs across sync library helpers, Tokio async file-backed helpers, and the sync-only decrypt CLI
• broader protected-format support across Common Encryption, PIFF compatibility, OMA DCF, Marlin IPMP ACBC/ACGK, and the retained IAEC protected-movie path
• typed protection-box and descriptor support needed by those decrypt flows
• retained fixture and parity-harness expansion across sync, async, CLI, fragmented, and protected-movie cases
• fragmented multi-sample-entry decrypt support, including per-fragment sample-description switching and ordered zero-KID track-key binding
• non-fragmented sample_description_index closure, including positive Marlin coverage above 1 and explicit first-description-only OMA/IAEC protected-movie limits where that matches the reviewed higher-level behavior