Flatpage routes now raise a 404 when they should

[eyeseast]

Made flat pages work like other API calls and added tests.

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	21.74%	6630 / 30496
🔵	Statements	21.74%	6630 / 30496
🔵	Functions	39.49%	141 / 357
🔵	Branches	56.88%	351 / 617

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
src/lib/api/flatpages.ts	72.97%	50%	50%	72.97%	10-17, 29-30
src/routes/(pages)/[...path]/+page.svelte	0%	0%	0%	0%	1-14
src/routes/(pages)/[...path]/+page.ts	0%	0%	0%	0%	1
src/routes/(pages)/home/+page.ts	0%	0%	0%	0%	1

Generated in workflow #546 for commit e797f0a by the Vitest Coverage Report Action

[allanlasser]

So standard! Love it.