Refactor application

[marvinruder]

• Migrate from express to hono
• Restructure backend files similar to Nest.js
• Use TypeScript strict mode and fix related issues
• Use Zod and OpenAPI integration of Hono to validate requests and responses
• Use typed Hono Client in frontend
• Validate environment variables with Zod
• Allow configuration of number of trusted proxies
• Add security-related headers to all HTTP responses
• Replace supertest instance with Hono and app.request

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: +0.00%)	✅ 100.00% (target: 100.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (414aff7)	9812	9812	100.00%
Head commit (a6efb0e)	11618 (+1806)	11618 (+1806)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1528)	8057	8057	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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