fix(programs): set suggested set programExerciseId to the real exercise id

[evan188199-tech]

What

In get-session-by-slug.action.ts, each suggested set's programExerciseId is filled with the session-exercise id instead of a program-exercise reference — a copy/paste assigning the same value to two fields.

suggestedSets: ex.suggestedSets.map((set) => ({
  id: set.id,
  programSessionExerciseId: set.programSessionExerciseId,
  programExerciseId: set.programSessionExerciseId,   // ← same as above

set.programSessionExerciseId is the parent ProgramSessionExercise.id (ex.id). The ProgramSuggestedSet model has no programExerciseId column, so the field is synthesized — and it's synthesized to the wrong value: it always mirrors programSessionExerciseId. The real program-exercise identity in this scope is ex.exerciseId (the underlying Exercise.id).

Impact

Latent: the current ProgramSessionClient doesn't read programExerciseId (it consumes types/valuesInt/valuesSec/units), so today's UI is unaffected. But SuggestedSet declares the field, so any future consumer or test gets a silently wrong value.

Fix

Carry the parent's real exercise id into the mapped set:

programExerciseId: ex.exerciseId,

Fixes #228.

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[evan188199-tech]

此 PR 由 GLM-5.2 修复。