Make it 3$ for EVERYONE, not just old users

[itzmetanjim]

Right now, because of some bug, old users have 3$ limit but new users have a 4$ limit. This commit fixes that and makes everyone have a 3$ limit.

[Copilot]

Pull request overview

Updates the application’s default daily spending limit behavior so that UI display, middleware enforcement, OpenRouter key provisioning, and the DB default/migration all use the same fallback limit.

Changes:

• Set default spending limit fallback to $3 across UI (Header), request limiting middleware, and OpenRouter key provisioning.
• Change users.spending_limit_usd database default to 3 and add a migration to update existing rows that are 4 → 3.
• Add corresponding Drizzle migration metadata (snapshot + journal entry).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/views/components/Header.tsx	Aligns displayed limit fallback with the server/DB default (now “3”).
src/middleware/limits.ts	Enforces the default limit fallback as “3” when user has no explicit limit.
src/lib/openrouter-keys.ts	Provisions/syncs OpenRouter key limit using fallback “3”.
src/db/schema.ts	Changes spendingLimitUsd column default from “4” to “3”.
drizzle/meta/0016_snapshot.json	Adds schema snapshot reflecting the new default.
drizzle/meta/_journal.json	Records the new migration entry.
drizzle/0016_normal_basilisk.sql	Applies DB default change + updates existing users from 4 to 3.

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