Update API files for Sync26 rc2.1

[lihaojie-CMCC]

What this PR does / why we need it:

Fix issues for rc2.1

Which issue(s) this PR fixes:

Fixes #37 #38 #39 #40 #41 #42 #43 #44 #45 #46 #47 #48 #49 #50 #51 #52

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🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	4		0	0.01s
✅ API	spectral	3		0	4.04s
✅ GHERKIN	gherkin-lint	3		0	0.96s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	secretlint	yes		no	0.63s
✅ YAML	yamllint	3		0	0.51s

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[lihaojie-CMCC]

@tanjadegroot @hdamker , thank you both for the thorough review and all the valuable suggestions for the MaaS API. Every issue raised (#37–#52) has been addressed, and the detailed changes are documented in the corresponding issue threads.

I will update the changelog in a follow‑up snapshot PR to reflect all the adjustments for this rc2.1 release.

Could you please confirm that the revisions in this PR meet the requirements for the release? Thanks again for your help!