refactor: migrate OrgRepo, UserRepo, and device config to entity DAOs (#1235)

[marsof02]

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Part of Greenstand#1235 🦕

Summary

PR 2 of 6 for Greenstand#1235 — migrates leaf consumers off TreeTrackerDAO:

Stacks on Greenstand#1303 (branch chore/split-treetracker-dao).
Merge after PR 1, or review against that branch only.

TreeTrackerDAO is still used elsewhere; removed in a later PR.

Out of scope (follow-up PRs)

• PR 3 — session + tree callers
• PR 4 — planter (legacy)
• PR 5 — location + sync/dashboard
• PR 6 — remove TreeTrackerDAO, split tests