Fixed UI issues.

Fixed the issues on the details page of a Civil bond, create page and other UI elements not displaying:

1. Updated CivilBondsProspectController:

• editForm now uses findByProspectCodeWithCoupons instead of findByProspectCode.
• details uses findByProspectCodeWithCoupons and now adds: activeOffersCount, activePaymentsCount, activeAllocationsCount

2. Updated CivilBondProspectServiceImpl:

• Marked updateProspect as @Transactional.
• In updateProspect, prospect is loaded via findByProspectCodeWithCoupons before addCoupons.

Additionally, added Performance improvements:

1. Payment import and persistence optimization

• Added batched persistence for imported payments (saveAll in chunks + flush) to reduce persistence-context growth and memory pressure on large imports.
• Removed redundant object reconstruction during save (payments are now persisted directly).
• Marked read/query methods with @Transactional(readOnly = true).

2. Excel import parsing optimizations

• Replaced repeated formatter allocations with reusable formatters.
• Pre-sized collections where possible.
• Simplified row parsing flow to reduce unnecessary checks and allocations.
• Kept behavior compatible with existing import format.

3. Domain-level loop and collection efficiency

• Replaced stream-heavy aggregate operations with loop-based implementations in: updatePaymentMismatch(), getActiveOffersCount(), getActiveAllocationsCount(), getActivePaymentsCount()
• Optimized coupon handling: Sort once in addCoupons(...), Return unmodifiable list in getCoupons(), Added @OrderBy("couponDate ASC") for consistent ordering

4. Service-layer read-only transaction tuning

• Applied @Transactional(readOnly = true) to query-only methods to reduce dirty-check/flush overhead.
• Reduced repeated value-object and formatter creation in prospect service methods.