feat(amm): drive the create-pool liquidity preview from liquidityQuote

Both liquidity branches now quote through the lean composable ops. The create
path joins the add path (already on addLiquidityQuote) by reworking
liquidity_quote into a dual-mode create quote and wiring the form to it via
the resolvePool pool read. quoteNewPosition/amm_quote are no longer reached
from the UI.

FFI (modules/amm/ffi):
- liquidity_quote is dual-mode: price-only (initialPriceRealRaw, no amounts)
  returns the minimum opening deposit via minimum_opening_pair; supplied
  amounts return the actual deposit with the price derived from them. Emits
  actual/minimum amounts, expectedLp, lockedLp and the Q64.64 price.
- LiquidityQuoteRequest gains initial_price_real_raw (Option<String>, needed
  only in price-only mode).

Module (modules/amm/src):
- liquidityQuote forwards initialPriceRealRaw to the op.

UI (apps/amm/qml):
- Route create-vs-add on the pool read (resolvePool -> poolExists); create
  quotes via liquidityQuote, assembled into the missing-pool shape the form
  already consumes.
- poolStatus moves off the quote onto the flow's poolExists; the form derives
  activePool/missingPool from it. Trim the vestigial quote fields (canSubmit,
  requiresFreshLp, warnings, errors[], accountPreview, the "Pool" row) and drop
  the account-plan panel for parity with the swap view.
- Fix a real bug: a pair change now resets poolExists (resetPoolExistence) so
  resetPairDraft re-resolves the pool like a fresh selection. Otherwise an
  active pool kept stale (cleared) reserves with no re-quote, and the deposit
  ratio-fill silently no-op'd.

Tests (apps/amm/tests):
- Read activePool instead of the removed poolStatus. The add test waits for the
  reset's active-pool quote to settle (reserves reloaded) before the ratio-fill;
  the create test resets the draft to clear leftover cross-run amounts and the
  stale submitted transactionId.

modules/amm/src/amm_module_impl.cpp

@@ -753,6 +753,11 @@ LogosMap AmmModuleImpl::liquidityQuote(const LogosMap& request) {
         {"tokenAId", token_a},
         {"tokenBId", token_b},
     };
+    // initialPriceRealRaw is the Q64.64 opening price; used when no amounts are supplied
+    // (price-only ⇒ the op returns the minimum opening deposit). Left out if absent.
+    std::string price_decimal;
+    if (jsonAmountToDecimal(request.value("initialPriceRealRaw", json()), price_decimal))
+        quoteRequest["initialPriceRealRaw"] = price_decimal;
     if (request.contains("amountARaw")) {
         std::string amount_a_decimal;
         if (!jsonAmountToDecimal(request.at("amountARaw"), amount_a_decimal))
@@ -770,8 +775,8 @@ LogosMap AmmModuleImpl::liquidityQuote(const LogosMap& request) {
     if (!quoteResult.ok)
         return error(quoteResult.error.empty() ? "backend_error" : quoteResult.error);
 
-    // Success: wrap { amountARaw, amountBRaw, expectedLpRaw, lockedLpRaw,
-    // initialPriceRaw } in the standard envelope.
+    // Success: wrap { actualAmountARaw, actualAmountBRaw, minimumAmountARaw,
+    // minimumAmountBRaw, expectedLpRaw, lockedLpRaw, initialPriceRealRaw } in the envelope.
     LogosMap out = quoteResult.value;
     out["status"] = "ok";
     out["error"] = "";