fix(import): accept documented exercise CSV aliases

[Xmemo]

Summary

Fixes #167 by making the exercise CSV importer accept the values already documented in the CSV generation prompt.

What changed

• Added normalizeExerciseAttributeValue(attributeName, value) for importer-safe attribute value normalization.
• Added attribute-aware aliases:
  • PRIMARY_MUSCLE / SECONDARY_MUSCLE: CORE -> ABDOMINALS
  • EQUIPMENT: BODYWEIGHT -> BODY_ONLY
  • EQUIPMENT: RESISTANCE_BAND -> BANDS
  • TYPE: FLEXIBILITY -> STRETCHING
• Kept existing N/A-like handling (N/A, NA, NONE, NULL, empty string -> NA).
• Improved unknown attribute value errors so the log includes the attribute name, bad value, and useful examples.
• Updated the CSV generation prompt to prefer canonical schema values while documenting accepted aliases.
• Added a focused assertion script for the normalization behavior.

Why

The CSV prompt previously told users or LLMs to generate values like CORE, but ExerciseAttributeValueEnum uses ABDOMINALS. That mismatch makes self-hosted custom exercise imports fail or silently lose useful muscle attributes.

Testing

Passed:

• pnpm exec tsx scripts/import-exercise-attribute-values.test.ts
• pnpm exec eslint scripts/import-exercise-attribute-values.ts scripts/import-exercise-attribute-values.test.ts scripts/import-exercises-with-attributes.ts
• git diff --check HEAD~1 HEAD

Checked but not clean on current base:

• pnpm exec tsc --noEmit --pretty false fails on existing public image module imports such as @public/logo.png, @public/images/trophy.png, and equipment images.
• pnpm lint fails on existing unrelated import/order and unused React warnings/errors across the app. The files touched by this PR pass the targeted ESLint command above.

Not run:

• Full CSV import against PostgreSQL. The importer requires a configured DATABASE_URL; this PR verifies the normalization layer directly and keeps database behavior unchanged.

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