refactor: Complete Phase A - Stabilize codebase#76

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salvac12 wants to merge 11 commits intoAI4Finance-Foundation:masterfrom

salvac12:pr-phase-a

Commits on Jan 15, 2026

docs(governance): add coding standards and migration plan

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fix(security): remove bare excepts and add input validation

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refactor: delete redundant code and archive tutorials

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refactor(i18n): migrate config_portfolios.py to English

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refactor(i18n): migrate core modules to English

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test(phase4): add testing infrastructure with pytest and vitest

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feat(metrics): add historical metrics API and Vercel deployment support

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chore: add coverage and log files to gitignore

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feat(errors): add custom exception hierarchy and structured logging

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refactor(architecture): add DI container and abstract base classes (Phase 6)

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feat(migration): complete Phase 7 Streamlit to Next.js migration

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