docs(developer-guide): add a Developer Guide section

Two pages, both aimed at SAS developers rather than end users:

- Filter in a Pre-Edit Hook: what editors/getdata returns (sasparams.FILTER_TEXT
  and the query clauses, never FILTER_RK), when PRE_EDIT_HOOK runs relative to
  the filter, and a worked example that widens a date filter to the previous
  quarter - re-reading the table so the rows match, and keeping Row Level
  Security applied to both branches.
- One Table, Two Rule Sets: moved from the datacontroller.io blog, so the
  developer-facing material lives in one place. Images moved to docs/img/.
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