feat: add nextcloud integration

[manuel-rw]

Homarr

Thank you for your contribution. Please ensure that your pull request meets the following pull request:

• Builds without warnings or errors (pnpm build, autofix with pnpm format:fix)
• Pull request targets dev branch
• Commits follow the conventional commits guideline
• No shorthand variable names are used (eg. x, y, i or any abbrevation)

[deepsource-io]

Here's the code health analysis summary for commits 0b07f22..8d74bfe. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	23.21%	9920 / 42722
🔵	Statements	23.21%	9920 / 42722
🔵	Functions	29.96%	415 / 1385
🔵	Branches	64.95%	1186 / 1826

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/definitions/src/integration.ts	98.75%	100%	40%	98.75%	169, 172
packages/integrations/src/index.ts	100%	100%	100%	100%
packages/integrations/src/base/creator.ts	54.9%	100%	0%	54.9%	32-48, 51-62
packages/integrations/src/nextcloud/nextcloud.integration.ts	10.95%	100%	0%	10.95%	17-19, 22-84, 87-96
packages/widgets/src/calendar/calendar-event-list.tsx	0%	0%	0%	0%	1-127

Generated in workflow #5444 for commit 8d74bfe by the Vitest Coverage Report Action