fix(ai-chat): use correct Clinic schema in knowledge-base query

The Clinic entity has never had weekdayHours / saturdayHours /
sundayHours. Schema uses 7 booleans (openMonday..openSunday) + a single
opensAt/closesAt pair, and requiredDocuments is a RELATION
(ClinicRequiredDocumentConnection), not a scalar TEXT.

Query was failing silently since 2026-03-18 — AI chat knowledge base
was missing clinic info for a month.

Fix:
- Query the real fields: openMonday..openSunday, opensAt, closesAt
- Render "Open: Mon, Tue, ... HH:MM–HH:MM" + "Closed: Sat, Sun"
- Walk requiredDocuments.edges for documentType list instead of treating
  it as a string

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ai/ai-chat.controller.ts

@@ -567,16 +567,23 @@ export class AiChatController {
                 `{ clinics(first: 20) { edges { node {
                     id name clinicName
                     addressCustom { addressStreet1 addressCity addressState addressPostcode }
-                    weekdayHours saturdayHours sundayHours
+                    openMonday openTuesday openWednesday openThursday openFriday openSaturday openSunday
+                    opensAt closesAt
                     status walkInAllowed onlineBooking
-                    cancellationWindowHours arriveEarlyMin requiredDocuments
+                    cancellationWindowHours arriveEarlyMin
                     acceptsCash acceptsCard acceptsUpi
+                    requiredDocuments { edges { node { documentType notes } } }
                 } } } }`,
                 undefined, auth,
             );
             const clinics = clinicData.clinics.edges.map((e: any) => e.node);
             if (clinics.length) {
                 sections.push('## CLINICS & TIMINGS');
+                const dayFlags: Array<[string, string]> = [
+                    ['Mon', 'openMonday'], ['Tue', 'openTuesday'], ['Wed', 'openWednesday'],
+                    ['Thu', 'openThursday'], ['Fri', 'openFriday'],
+                    ['Sat', 'openSaturday'], ['Sun', 'openSunday'],
+                ];
                 for (const c of clinics) {
                     const name = c.clinicName ?? c.name;
                     const addr = c.addressCustom
@@ -584,9 +591,15 @@ export class AiChatController {
                         : '';
                     sections.push(`### ${name}`);
                     if (addr) sections.push(`  Address: ${addr}`);
-                    if (c.weekdayHours) sections.push(`  Mon–Fri: ${c.weekdayHours}`);
+                    const openDays = dayFlags.filter(([, flag]) => c[flag]).map(([label]) => label);
-                    if (c.saturdayHours) sections.push(`  Saturday: ${c.saturdayHours}`);
+                    if (openDays.length) {
-                    sections.push(`  Sunday: ${c.sundayHours ?? 'Closed'}`);
+                        const hours = c.opensAt && c.closesAt ? ` ${c.opensAt}–${c.closesAt}` : '';
+                        sections.push(`  Open: ${openDays.join(', ')}${hours}`);
+                    }
+                    const closedDays = dayFlags.filter(([, flag]) => !c[flag]).map(([label]) => label);
+                    if (closedDays.length) {
+                        sections.push(`  Closed: ${closedDays.join(', ')}`);
+                    }
                     if (c.walkInAllowed) sections.push(`  Walk-ins: Accepted`);
                 }
 
@@ -594,7 +607,8 @@ export class AiChatController {
                 const rules: string[] = [];
                 if (rulesClinic.cancellationWindowHours) rules.push(`Free cancellation up to ${rulesClinic.cancellationWindowHours}h before`);
                 if (rulesClinic.arriveEarlyMin) rules.push(`Arrive ${rulesClinic.arriveEarlyMin}min early`);
-                if (rulesClinic.requiredDocuments) rules.push(`First-time patients bring ${rulesClinic.requiredDocuments}`);
+                const docs = rulesClinic.requiredDocuments?.edges?.map((e: any) => e.node?.documentType).filter(Boolean) ?? [];
+                if (docs.length) rules.push(`First-time patients bring: ${docs.join(', ')}`);
                 if (rulesClinic.walkInAllowed) rules.push('Walk-ins accepted');
                 if (rulesClinic.onlineBooking) rules.push('Online booking available');
                 if (rules.length) {