The turnaround 2-7 → 5⁷ → 1Δ7 (Dm7 G7 Cmaj7).
the ONE parent major scale over all three chords — SCL·04
or think it per-chord — Dorian on the ii, Mixolydian on the V, Ionian on the I (same 7 notes, moved home) KC·29
All three chords live in one key, so one scale covers them. The 'modes per chord' trick is the same notes re-centered — useful for targeting each chord's color tones.