feat(investment): add Treasury Investment module (FD, Govt Sec/Non-SLR/Bond/MF, Share)

Adds full frontend-only Investment module mirroring the legacy AutoBank CBS
Investment menu: Dashboard, FD/Bond/Share entry screens (purchase, interest,
sell/redeem, write-off, amortize and more), 10 master screens, an Interest
calculation/register screen, and ~21 reports. All figures are derived from a
single holdings/transactions dataset so entry, interest, and reports can
never drift out of sync. Wires the new "Investment" mega-menu into the shell
and routes the previously inert Investment stub buttons.

src/environments/.env.ts

@@ -10,7 +10,7 @@
 export default {
   'mifos_x': {
     'version': '260731',
-    'hash': 'ca85bae4'
+    'hash': 'fd28788d'
   },
   'allow_switching_backend_instance': true
 };