feat(auth): auto-join organizations for self-hosted mode

[kylecarbs]

Summary

When running in self-hosted mode, this PR implements automatic organization membership for new users:

• First user signup: Creates a 'default' team organization and makes the user an owner
• Subsequent users: Automatically added as members to all existing team organizations

This simplifies user management for self-hosted deployments where all users should have access to shared team organizations by default.

Changes

File	Change
internal/api/src/server.ts	Added autoJoinOrganizations?: boolean binding
internal/database/src/querier.ts	Updated insertUser() with auto-join logic
internal/api/src/routes/auth/auth.server.ts	Pass flag in OAuth and credentials signup
packages/server/src/server.ts	Enable autoJoinOrganizations: true for self-hosted

Behavior

Scenario	Result
First user signs up	Personal org + 'default' team org (user is owner)
Subsequent users	Personal org + member of all existing team orgs
New team org created later	Only future signups join it

Testing

• All modified packages typecheck successfully
• Build passes

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Project	Deployment	Review	Updated (UTC)
blink	Ready	Preview, Comment	Jan 20, 2026 2:59pm