feat(routes-f): add seeded fake user data generator

[edehvictor]

Closes #574

Changes

• Added GET /api/routes-f/fake-users?count=5&seed=42.
• Implemented deterministic seeded generation for { id, name, email, phone, address, avatar_url }.
• Added local name/street/city pools under the feature folder.
• Enforced count validation (default 5, max 100).
• Added unit tests for seed determinism, count cap, and response shape.

Testing

• Not run (per request).

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