feat(security): JWT required on every API route, gated dev fallback, role checks

- main.py: global get_current_user dependency on all routers except
  /auth/login and /health; prod fail-fast startup guard rejects wildcard
  CORS, default credentials, DEV_LOGIN_ENABLED
- inventory/pm: X-User-Role header identity fallback now only active when
  PROCUREMENT_DEV_LOGIN_ENABLED=true (was unconditional in production)
- item_decisions writes + attachment deletes: require_role(
  procurement_manager, admin) — require_role was defined but never used
- config.py: ENVIRONMENT flag, comma-separated CORS_ORIGINS, no default
  Casdoor client secret/admin password, DEV_LOGIN_ENABLED=false
- frontend: authenticated file downloads (Bearer + blob) — <a href> links
  cannot send the token; FileList/QuoteDetail/AcceptModal/EditModal/
  PurchaseHistory converted; DEV_LOGIN_ENABLED build arg defaults false
- smoke tests authenticate via POST /auth/login (SMOKE_USER/SMOKE_PASSWORD)
- traefik: security headers, API rate limit, 12MB body cap (prod overlay)
- nginx client_max_body_size aligned to 12MB

frontend/src/pages/Suppliers/PurchaseHistory.tsx

@@ -112,28 +112,28 @@ export function PurchaseHistory({ supplier, quotes, materials }: PurchaseHistory
               ) : (
                 <>
                   {profs.map((pf) => (
-                    <a
+                    <button
                       key={"pf-" + pf.id}
+                      type="button"
                       className="detail-link"
-                      href={api.files.downloadUrl(q.id, "proforma", pf.id!)}
-                      download={pf.name}
                       title="دانلود پیش‌فاکتور"
+                      onClick={() => api.files.download(q.id, "proforma", pf.id!, pf.name)}
                     >
                       <Paperclip className="me-1 inline h-3 w-3" />
                       پیش‌فاکتور: {pf.name}
-                    </a>
+                    </button>
                   ))}
                   {invs.map((inv) => (
-                    <a
+                    <button
                       key={"inv-" + inv.id}
+                      type="button"
                       className="detail-link"
-                      href={api.files.downloadUrl(q.id, "invoice", inv.id!)}
-                      download={inv.name}
                       title="دانلود فاکتور"
+                      onClick={() => api.files.download(q.id, "invoice", inv.id!, inv.name)}
                     >
                       <Paperclip className="me-1 inline h-3 w-3" />
                       فاکتور: {inv.name}
-                    </a>
+                    </button>
                   ))}
                   {!loading && !profs.length && !invs.length && (
                     <span className="ph-attach-loading">فاکتوری ثبت نشده</span>