Handle GitHub release assets with pagination

[tyreseluo]

Issue Content

• Problem: Asset listing uses single-page calls with per_page: 100 (src/index.ts:758, src/index.ts:769, src/index.ts:979).
• Impact: Repos with >100 assets may miss deletions/replacements and create inconsistent uploads.
• Proposed fix: Use octokit.paginate for all release asset reads.