feat(deleter): email the org owners when a delete forfeits tokens

[whoAbhishekSah]

Part of #1837. Top of the stack, based on #1857.

Deleting an organization forfeits any unused tokens (the client confirms that with the user before calling). This PR adds the second half of that flow: the org owners get an email saying how many tokens were left and that support can transfer the amount to their bank account.

How it works:

• The email subject and body come from new config keys billing.token_forfeit_notice.subject and billing.token_forfeit_notice.body. Both are Go templates with .Amount (tokens forfeited), .Org (the deleted organization), and .User (the owner receiving the mail). Empty config falls back to plain built-in text. This is the same pattern the PAT expiry alert emails use.
• The mail goes through the shared app.mailer dialer to every user holding the org owner role.
• The owners and the token amount are read before teardown starts (both are gone after), but the mail is only sent after the delete fully succeeded. A failed delete never emails anyone, and repeated calls on a deleted org return not_found before any of this runs, so nobody gets the mail twice.
• A send failure is logged and never fails the API call — the org is already gone at that point.

Side change: the org lookup at the start of the delete switched from Get to GetRaw, so a disabled org keeps its title for the email and stays deletable without the ErrDisabled special case.

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
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[coveralls]

Coverage Report for CI Build 31695140194

Coverage increased (+0.07%) to 48.428%

Details

• Coverage increased (+0.07%) from the base build.
• Patch coverage: 32 uncovered changes across 3 files (102 of 134 lines covered, 76.12%).
• No coverage regressions found.

Uncovered Changes

File	Changed	Covered	%
core/deleter/forfeit_notice.go	101	72	71.29%
core/deleter/service.go	32	30	93.75%
cmd/serve.go	1	0	0.0%

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	40008
Covered Lines:	19375
Line Coverage:	48.43%
Coverage Strength:	15.39 hits per line

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💛 - Coveralls