feat(jobs/new): live price quote with discount breakdown for the clinic

Clinics couldn't see what an order would cost them before publishing.
Added a server-priced quote box that updates as the lab, prosthetic type
and tooth selection change. Three rendered states:

  1. Discounted (custom unit price or discountPercent):
       Katalog (4 × 1.500 ₺)      6.000 ₺
       Klinik indirimi (%15)       -900 ₺
       ──────────────────────
       Toplam                    5.100 ₺

  2. Plain catalog match (no clinic override):
       4 × 1.500 ₺               6.000 ₺
       'Katalog fiyatı uygulanıyor'

  3. No catalog row for the chosen type:
       'Fiyat işe başlanırken laboratuvar tarafından belirlenecek'

Bits to make this work
  - calculateJobPrice now returns catalogUnitPrice, catalogTotal, savings
    and teethCount alongside the final amount, so the client can render
    a breakdown without reaching for any other table.
  - POST /api/pricing/quote endpoint guards on clinic kind + an approved
    connection before exposing pricing — no leaking catalog data to
    unconnected clinics, and no per-lab discount snooping.
  - NewJobForm's lab and prosthetic Selects became controlled (hidden
    inputs mirror state to the form action), and a debounced effect
    (250ms) re-fetches the quote when any of {lab, type, teeth.length}
    changes. AbortController cancels in-flight requests when inputs change
    again.

src/lib/appwrite/pricing.ts

@@ -17,6 +17,14 @@ export type JobPriceQuote = {
   currency: string;
   source: "clinic_custom" | "clinic_discount" | "catalog";
   unitPrice: number;
+  /** Lab's listed catalog price before any clinic override, if a catalog row exists. */
+  catalogUnitPrice?: number;
+  /** catalogUnitPrice × teethCount; useful for showing the clinic the saving. */
+  catalogTotal?: number;
+  /** catalogTotal - amount; positive when the clinic is getting a discount. */
+  savings?: number;
+  /** teethCount passed in, echoed back so the client can format breakdowns. */
+  teethCount: number;
   discountPercent?: number;
 };
 
@@ -77,14 +85,25 @@ export async function calculateJobPrice(opts: {
   const labSettings = labSettingsRes.rows[0] as unknown as TenantSettings | undefined;
 
   const fallbackCurrency = labSettings?.defaultCurrency ?? "TRY";
+  const catalogUnitPrice = catalog?.unitPrice;
+  const catalogTotal =
+    catalogUnitPrice !== undefined ? catalogUnitPrice * opts.teethCount : undefined;
 
   if (override?.customUnitPrice !== undefined && override.customUnitPrice !== null) {
     const unit = override.customUnitPrice;
+    const amount = unit * opts.teethCount;
     return {
-      amount: unit * opts.teethCount,
+      amount,
       currency: override.currency || catalog?.currency || fallbackCurrency,
       source: "clinic_custom",
       unitPrice: unit,
+      catalogUnitPrice,
+      catalogTotal,
+      savings:
+        catalogTotal !== undefined && catalogTotal > amount
+          ? catalogTotal - amount
+          : undefined,
+      teethCount: opts.teethCount,
     };
   }
 
@@ -96,12 +115,17 @@ export async function calculateJobPrice(opts: {
     override.discountPercent > 0
   ) {
     const discounted = catalog.unitPrice * (1 - override.discountPercent / 100);
+    const amount = discounted * opts.teethCount;
     return {
-      amount: discounted * opts.teethCount,
+      amount,
       currency: override.currency || catalog.currency || fallbackCurrency,
       source: "clinic_discount",
       unitPrice: discounted,
+      catalogUnitPrice: catalog.unitPrice,
+      catalogTotal,
+      savings: catalogTotal !== undefined ? catalogTotal - amount : undefined,
       discountPercent: override.discountPercent,
+      teethCount: opts.teethCount,
     };
   }
 
@@ -110,5 +134,8 @@ export async function calculateJobPrice(opts: {
     currency: catalog.currency || fallbackCurrency,
     source: "catalog",
     unitPrice: catalog.unitPrice,
+    catalogUnitPrice: catalog.unitPrice,
+    catalogTotal,
+    teethCount: opts.teethCount,
   };
 }