feat(investment): settle purchases to post them to GL on the settlement date

Settlement-date accounting (RBI UCB Investment Directions, confirmed by
Jitendra Sir): a saved purchase is PENDING_SETTLEMENT with nothing in GL.
On or after its settlement date, POST /investment/purchases/{id}/settle
posts the journal entry dated the settlement date at Head Office - Dr
investment GL (book value), Dr 500606 broken-period interest, Dr charge
GLs, Cr the paying bank - through the journal entry command, which also
raises the JV voucher. The deal becomes ACTIVE and keeps the GL
transaction id and settlement day. Settle goes through maker-checker; a
settled deal can no longer be dropped.

Broken-period interest is now counted up to the settlement date instead
of the deal date, and the interest schedule starts from it.

Migration 0597 adds the settlement columns and the SETTLE permission.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

fineract-core/src/main/java/org/apache/fineract/commands/service/CommandWrapperBuilder.java

@@ -151,6 +151,14 @@ public class CommandWrapperBuilder {
         return this;
     }
 
+    public CommandWrapperBuilder settleInvestmentPurchase(final Long purchaseId) {
+        this.actionName = "SETTLE";
+        this.entityName = "INVESTMENTPURCHASE";
+        this.entityId = purchaseId;
+        this.href = "/investment/purchases/" + purchaseId + "/settle";
+        return this;
+    }
+
     public CommandWrapperBuilder createInvestmentDailyRate() {
         this.actionName = "CREATE";
         this.entityName = "INVESTMENTDAILYRATE";