Prepare 2.0.0 release

[alxgsv]

Summary by CodeRabbit

• Changelog

  • Revised v2.0.0 release notes to reflect breaking changes, condensed features/improvements, updated throttling retry behavior, upload/metadata behavior, structured error exports, and URL/CDN rewrite helpers; minor whitespace normalizations in older entries.

• Documentation

  • Expanded README with configuration examples (auth, User-Agent, retry, CDN), upload usage (auto direct/multipart, metadata), and examples for metadata and addon services.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ff8b62ca-c8f0-409f-8507-8de53b2f1cc1

📥 Commits

Reviewing files that changed from the base of the PR and between 0815413 and f0e2de5.

📒 Files selected for processing (2)

• CHANGELOG.md
• README.md

✅ Files skipped from review due to trivial changes (1)

• CHANGELOG.md

🚧 Files skipped from review as they are similar to previous changes (1)

• README.md

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Walkthrough

Updates CHANGELOG.md for v2.0.0 (breaking changes, features, improvements, whitespace fixes) and expands README.md with import examples, extended NewConfig usage (auth, User-Agent, retry, CDN), and usage examples for uploads, metadata, and addon execution.

Changes

Documentation and Release Notes

Layer / File(s)	Summary
v2.0.0 Release Notes and Changelog Maintenance CHANGELOG.md	CHANGELOG.md v2.0.0 entry is revised with updated BREAKING CHANGES (REST API target v0.7, removed APIs, field type changes, and Go version requirement), condensed FEATURES (throttling retry, upload behavior, error exports, CDN rewrite helpers), and adjusted IMPROVEMENTS. Two older changelog entries have whitespace normalized.
Installation and Configuration Documentation README.md	README.md Installation section is extended with metadata and addon package imports. Configuration example expands ucare.NewConfig usage to show sign-based auth, custom User-Agent, throttling retry settings, and CDN base URL override (with notes on default CDN rewriting).
Usage Examples for New Features README.md	README.md Usage section replaces the basic upload example with uploadSvc.Upload (automatic direct vs multipart selection, per-file metadata). Adds examples for managing per-file metadata via the metadata service and executing an add-on with status polling via the addon service.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Prepare 2.0.0 release' directly and accurately describes the main objective of the pull request, which is to prepare the 2.0.0 release by updating CHANGELOG.md and README.md with breaking changes, features, and usage examples.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/2.0.0

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