feat(routesF): add random named color picker endpoint

[fortezzalaboratory]

Summary

• Add GET /api/routesF/random-named-color-picker with support for count, seed, and group=reds|blues|any.
• Bundle CSS named color entries with hex values and route-scoped group metadata inside app/api/routesF/random-named-color-picker/.
• Return deterministic seeded output as { colors: [{ name, hex, rgb }] } with validation for invalid groups.

Verification

• Added route-level tests for deterministic seeded output.
• Added route-level tests for reds and blues group filtering.
• Added coverage for response shape, defaults, invalid group handling, and count bounds.

Closes #846

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