fix: fix api routes

[asbiin]

Fixes:

• POST /activities/ and PUT /activities/:id now checks for ActivityType activity_type_id to be from the same account
• DELETE /activities/:id now works
• GET /activitytypes/ is filtered to the account
• GET /lifeevents/:id now works

Changes:

• POST /contacts/:contact_id/pets is replaced with POST /pets/, with the use of contact_id (the route already exists)
• PUT /contacts/:contact_id/pets/:id is replaced with PUT /pets/:id, with the use of contact_id (the route already exists)
• Every validator fails now send a HTTP 400 code (was 200) with the error 32
• Every Invald Parameters errors now send a HTTP 400 (was 500 or 200) code with the error 41
• Every QueryException now send a HTTP 500 code with the error 40

[djaiss]

Amazing work @asbiin

[djaiss]

@asbiin don't forget the CHANGELOG though!

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