chore: update standardized study materials intro in roadmaps

[google-labs-jules]

Added the standardized phrase "Para formar o Desenvolvedor Completo em 2026 (do Júnior ao Especialista)" to all 4 roadmap files (ROADMAP.md, roadmaps/general/2026-specialist-patterns.md, roadmaps/general/common.md, and roadmaps/general/study-guide.md) that were missing this formatting for the "Materiais de Estudo Recomendados" section. Verified VitePress is fully setup and correctly rendering the updated contents.

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PR created automatically by Jules for task 7848684846246028242 started by @juninmd

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