## Why
### Problem
As new features are added, dashboard and settings pages have been
accumulating extra database queries — risking N+1 regressions and
degraded response times. There was no automated way to detect these
regressions before they reach production.
## What
### Changes
- **New `Performance` test suite** (`tests/Performance/`) with 25 tests
that enforce query count ceilings on every page and API endpoint
accessible from the sidebar
- `PageQueryCountTest.php` — 15 tests covering Dashboard, Accounts,
Transactions, Budgets, Cashflow, and all Settings pages, plus scaling
tests that prove query count stays constant as data volume grows
- `ApiQueryCountTest.php` — 10 tests covering all Dashboard and Cashflow
analytics API endpoints, plus scaling tests
- **Separate CI job** (`performance-tests`) that runs in parallel with
`tests` and `linter`, and gates both `build-image` and `deploy`
- **Excluded from the main `tests` job** to avoid running them twice
(`--exclude-testsuite=Performance`)
- Helper functions (`performanceSeedUser`, `countQueries`,
`assertMaxQueries`) added to `tests/Pest.php` for reuse
- `phpunit.xml` updated with the new `Performance` testsuite entry
### How it works
Each test seeds a user with realistic data (3 accounts, 30 transactions,
15 balances, 5 categories, 3 labels, 1 budget) and asserts the endpoint
executes **at most N queries**. Thresholds have a small buffer (~3
queries) above current counts — tight enough to catch N+1 regressions
(which add dozens of queries) but loose enough to not break on minor
legitimate changes. On failure, every executed SQL query is dumped for
easy debugging.
### Run locally
```bash
php artisan test --testsuite=Performance
```
## Verification
### Tests
All 25 performance tests pass. Existing Feature (633) and Unit (22)
suites unaffected.
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