fix(route/twitter): defensive fallback for missing profile_image_url (avoid /twitter/user/* 503)

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When api.getUser() returns user info without profile_image_url (observed when X changes API contract, see DIYgod#22136), the unguarded .replace() call on user.ts:91 throws TypeError and the entire /twitter/user/* route returns 503. Add optional chaining + fallback to X's default profile image, allowing the route to degrade gracefully instead of crashing the whole feed. This is a defensive guard only; the root cause (X API contract change) is tracked in DIYgod#22136 and requires updates to gql-id-resolver / query IDs / GraphQL features.

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