feat: implement oauth2 client credentials flow to access api

[getlarge]

• Fixes feat: implement OAuth2 client credentials flow to access API #34
• Fixes fix: resolve classes correctly in controller #29

[nx-cloud]

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✅ Successfully ran 3 targets

• nx affected:test --parallel=4 --exclude=workspace --ci --verbose
• nx affected:lint --parallel=4 --exclude=workspace --verbose
• nx run-many --target=build --parallel=4 --projects=auth,expiration,ng-client,orders,payments,tickets --verbose

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