feat(cma): treasury stage-1 MVP - migration, models, endpoints, rules, 2 pages
G1 review fixes P0-1/P0-2/P1-3/P1-4/P1-5/P2-6/P2-7/P2-8 applied: - up() filters comment lines then asserts missing_tables == [] (CREATE hits 6/6) - created counter = new-object diff via information_schema (idempotent second run = 0) - down() drops columns per-column, dumps via write-path creds + fail-closed - seeds expanded to 8 rules + 6 limits; data_status DEFAULT estimated - no physical FK (app-layer checks), amount FLOAT wan-yuan, round(x,4) Scope: 6 treasury_* tables + cash_plans 4 added columns; cash.py untouched. Not pushed: deploy is approval-gated (de851257).
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