IrCurveGenerationConfigDetailDialog's index_family combo doesn't list the new RFR/IBOR families

IrCurveGenerationConfigDetailDialog.cpp's setupIndexFamilyCombo()- style block populates ui_->indexFamilyCombo with a hand-written list of addItem calls – confirmed via codegen entity generate ir_curve_generation_config --diff: a full regen from the current .org model would delete this population entirely (along with a sibling updateTenorComboForIndexFamily() method and a service-layer validate_index_family composite validator), meaning none of these are driven by any documented paste-block seam – they're direct hand- patches on generated files. Task C80D94BB widened index_family's allowed values from 6 to 22 (via the .org model's static_combo field list and SQL Checks table, generated narrowly via --address ores.sql.schema specifically to avoid clobbering these hand-patches), but could not safely propagate that to the Qt combo without either running the destructive full regen or hand-editing the generated file again (both out of bounds).

The interactive "create a new IR curve config" flow in the Qt Market Simulator still only offers the original 6 families (libor=/=euribor=/=sofr=/=estr=/=sonia=/=tona) in its dropdown, even though the schema, SQL publish pipeline, and DQ seed data now support 22 (see task C80D94BB, story C29FE5A3). A user manually creating an IR curve config for e.g. AUD/AONIA via the Qt dialog cannot select it. Proper fix: add a real paste-block seam for Qt static-combo population (and, separately, for service-layer composite validators) to the codegen templates – mirroring the mdi_window=/=controller header+impl seam pattern already established for toolbar actions/signals – then convert these three hand-patches onto it.

• projects/ores.qt/synthetic/src/IrCurveGenerationConfigDetailDialog.cpp (the hand-patched combo population)
• projects/ores.synthetic/core/src/service/ir_curve_generation_config_service.cpp (validate_index_family, same problem)
• projects/ores.synthetic/modeling/ores.synthetic.ir_curve_generation_config.org (the entity model; index_family is now 22 values)
• projects/ores.codegen/docs/paste_blocks_in_codegen.org (existing paste-block catalogue to extend)
• Task: Fix realistic_2026 IR curve seed data / index_family enum mismatch