bookings: save Airbnb host threads and SF check-in details

Daly City host sent the check-in instructions on Sep 16: door code,
wifi, entry route, assigned parking and house rules. Add them to the
booking record and the Sep 19-21 address tables. Record the DTLA unit
number from the LA thread and store both message threads as sources.

sources/stays/2026-09-16_Airbnb_LA_DTLA_Chat.md

@@ -0,0 +1,74 @@
+# Airbnb — LA DTLA: message thread with host
+
+Reservation HMNBY9NYRN · Sep 26–30, 2026 · host Kye · booked by
+Konstantin, Maksim added as guest · captured Sep 16, 2026 from
+airbnb.ca/guest/messages.
+
+---
+
+**Konstantin (Booker) — Aug 31, 2026, 9:45 a.m.**
+
+> Hello. Me, my wife and our friends would like to stay at your wonderful
+> apartment during our vacation in LA. Would it be available?
+
+**Airbnb — Aug 31, 2026**
+
+> Your reservation is confirmed for 4 guests on Sep 27–30.
+
+**Kye (Host) — Aug 31, 2026, 9:48 a.m.**
+
+> Hello Konstantin,
+>
+> Thank you so much for booking our place for 3 nights from 27 Sep 2026
+> to 30 Sep 2026. Your stay is confimed for 4 guest(s) and 0 pet(s). If
+> you have different number of guests or pets please let me know to
+> adjust the reservation accordingly.
+>
+> Your rental address is 1100 W Temple Street, Los Angeles CA 90012
+>
+> Our office is located at 3213 Fowler St, Los Angeles, CA 90063, few
+> mins away from your rental in case you need anything during you stay!
+>
+> To access the location address, maps and other info, please click on
+> the link below:
+>
+> https://guest-portal.hostaway.com/65596088/dxYlP4ov
+>
+> Please make sure to complete the guest's online check-in form at your
+> earliest for our team to activate your rental entry code prior to your
+> arrival:
+>
+> https://guest-portal.hostaway.com/65596088/dxYlP4ov/check-in
+>
+> We will reach out to you before check in to share the detailed check in
+> guide. In the meantime, if you have any questions don't hesitate to
+> reach out
+>
+> Best regards,
+
+**Kye (Host) — Aug 31, 2026**
+
+> Hi Konstantin, your reservation is all set for your stay from September
+> 27th to September 30th. We're looking forward to hosting you and your
+> group! If you have any questions before your arrival, feel free to
+> reach out anytime.
+
+**Konstantin (Booker) — Sep 15, 2026, 12:03 p.m.**
+
+> Change requested · New dates Sep 26–30, 2026
+
+**Airbnb — Sep 15, 2026**
+
+> Alteration request accepted
+
+---
+
+Reservation panel, "Directions from your host":
+
+> Your rental address is: 1100 W Temple Street, Los Angeles CA 90012,
+> **Unit 703**
+> Our office address is: 3213 Fowler Street, Los Angeles CA 90063. We are
+> just couple mins away if you need anything during your stay.
+
+Check-in method: smart lock. "Please reach out to the host for how to
+check in." Detailed check-in guide still to come from the host.