feat(integrations): report google authorization status

[IamMuuo]

Add POST /integrations/google/status/, which answers whether the caller has granted the Google calendar and tasks capabilities. Not having granted them is a normal answer rather than a failure, so the check returns 200 either way and clients branch on the body.

When capabilities are missing the response relays Verisafe's authorization instruction verbatim. The client makes that call itself, supplying its own platform, redirect_uri, and bearer token: starting a consent flow needs the user's token, which this service deliberately does not hold. The url handed back is Verisafe's authorize endpoint, not the Google consent screen.

Check grants rather than requesting a token, so no Google credential is minted to answer a yes/no question. The token call happens only when something is missing, where it is expected to be refused, and the refusal is what carries the authoritative url and method.

Report a rejected service token as 502 rather than 403. A 403 would tell the client that the user must re-authorize, sending them through a consent flow to fix a misconfiguration that was never theirs.

Queue a pull when everything is granted, so a user who has just finished authorizing sees their tasks without waiting for the next scheduled sync.

[coderabbitai]

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