docs: prune stale API-doc references

[Jammy2211]

Summary

Phase A of the release-docs polish (PyAutoLabs/PyAutoLens#592) — API-doc cleanup for PyAutoGalaxy.

Prunes docs/api/*.rst autosummary entries for removed API:

• the OO plotting subsystem (MatPlot2D/Cmap/*Scatter wrappers, replaced by the functional plot API) — removed the "Plot Customization" + "Matplotlib Wrappers" sections from plot.rst;
• PySwarmsLocal/PySwarmsGlobal, AdaptImageMaker (kept AdaptImages) in modeling.rst;
• SettingsImaging/SettingsInterferometer and a duplicate Convolver in data.rst.

Re-audit reports zero broken/missing/duplicate references. The functional-API plot.rst rewrite is a filed follow-up.

Validation checklist (--auto, supervised)

• Tests: n/a — zero Python source changed (docs/api/*.rst only).
• Smoke: n/a — no downstream script surface in this repo's diff.
• Review: CLEAN — re-audit confirms every remaining autosummary reference resolves; CRLF preserved (byte-safe edits).
• Heart: YELLOW — reason set human-acknowledged at ship (5 chronic organism reasons; none from this change, none RED).

Autonomous run ended at PR-open; merge stays human. Library-first gate: this + PyAutoLens#593 merge before the autolens_workspace PR.

Part of PyAutoLabs/PyAutoLens#592.

🤖 Generated with Claude Code