Add notes field to WorkoutLog

[kmannarbor]

Adds an optional free-text notes field to the WorkoutLog model so users can record per-set observations (form cues, how it felt, etc.). The field is exposed via the existing REST API serializer.

Closes #2437

Proposed Changes

• wger/manager/models/log.py — add notes = TextField(blank=True, null=True)
• wger/manager/migrations/0028_add_notes_to_workout_log.py — migration
• wger/manager/api/serializers.py — expose notes in WorkoutLogSerializer
• wger/manager/tests/test_log_model.py — two new tests (saved/retrieved, optional)
• wger/manager/tests/test_log_session_api.py — two new tests (POST with notes, PATCH notes)

A companion PR to wger-project/react adds the UI: a notes input on the log form, a Notes column in the history grid, and a "Last session" hint showing the previous note when logging the same exercise again.

Related Issue(s)

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Code has been formatted to avoid unnecessary diffs (ruff format && isort .)
• If the feature is big enough or if there are manual steps needed (deployment
  changes etc.), write a small writeup in CHANGELOG.md

[kmannarbor]

Hi @rolandgeider — following up on this and the companion PRs (wger-project/react#1289, wger-project/flutter#1300) for the notes field from #2437.

Looks like the CI/CodeQL workflow runs on all three PRs expired waiting for approval (first-time contributor gate) rather than actually running. Could someone approve the workflow runs so CI can execute? Happy to push a fresh commit to re-trigger if that's easier. Let me know if anything else is needed for review.

[rolandgeider]

hey! I'll take a look at all these prs once we merge 2.7

[kmannarbor]

Thanks so much Roland!

…

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