[codex] Support docassemble 1.10 webapp APIs

[nonprofittechy]

Closes #258.

What changed

• Prefer the docassemble 1.10 locations for Flask/CSRF objects, API helpers, Redis, Celery context, cron, cloud, saved-file, filename, translation, playground, and interview helpers.
• Retain narrowly scoped fallbacks to the legacy locations used by docassemble 1.9.
• Move aldashboard.py from removed db_object and Model.query APIs to get_session(), session_scope(), and SQLAlchemy 2 select() statements.
• Add focused tests that verify the 1.10 import contract, force the 1.9 API fallback, and prevent legacy database access from returning.
• Keep the migration in three logical commits: webapp imports, database/session APIs, and compatibility tests.

Root cause

Docassemble 1.10 split the legacy docassemble.webapp.server, backend, and files modules into smaller packages, removed db_object, and changed its ORM models so they no longer expose Flask-SQLAlchemy's Model.query property. Updating import paths alone therefore fixed import-time errors but left dashboard user/session operations broken at runtime.

Impact

ALDashboard imports and registers its routes on docassemble 1.10 while retaining compatibility with pre-1.10 installations. Database reads now use explicit sessions and writes use transactional session scopes in both compatibility branches.

Validation

• python -m pytest -q — 363 passed
• python -m mypy docassemble/ALDashboard --config-file pyproject.toml
• python -m compileall -q docassemble/ALDashboard
• node --check docassemble/ALDashboard/data/static/pdf_labeler.js
• Focused export, attachment mapping, and static labeler extraction tests — 72 passed
• Source-overlay import smoke test against the local docassemble 1.10.1 checkout, including API, worker, dashboard, labeler, and translation modules
• Forced legacy-layout subprocess import test for the docassemble 1.9 fallback

Database queries were not executed against a live docassemble database; the session and query paths are covered structurally and by the full unit suite.