Fix billing:usage TDZ crash in dataforseo-account-usage

[edenlau]

Problem

pnpm billing:usage authenticates and prints the account balance, then crashes:

ReferenceError: Cannot access 'FUNCTION_TOTALS' before initialization
    at printFunctionTable (scripts/dataforseo-account-usage.ts:84)

Cause

The script invokes await main() at module top level (line 10) above the module-level const FUNCTION_TOTALS declaration. Top-level await suspends module evaluation at that statement, so when main() resumes after the fetchUserData() call, the rest of the module body — including the FUNCTION_TOTALS initializer — has still never run, and printFunctionTable hits the temporal dead zone.

Fix

Move the await main() invocation to the end of the file, after all module-level declarations — the same pattern seed-rank-tracking.ts and d1-default-project-cleanup.ts already use. Pure statement move, no behavior change otherwise.

Verification

• pnpm billing:usage against the real (free) GET /v3/appendix/user_data endpoint now prints the balance and both rolling-window spend tables with no crash.
• tsc --noEmit and oxlint --type-aware pass.
• Checked the other top-invoking scripts (backlinks-cost-profile.ts, brand-lookup-cost-profile.ts): they declare all module consts before their await main(), so they are unaffected.

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