fix: use the card's own SimCardCommands for ADM and AUTHENTICATE (v2.7.20)

/api/verify-adm sent VERIFY with CLA A0 on a UICC (SW 6E00) while
pySim-shell's verify_adm worked: fast init builds the card on its own
SimCardCommands instance, but __main__ kept server.scc at the startup
placeholder left at the SIM defaults; only an equip repointed it.

- __main__ adopts card._scc after init (cat_cla still set on it), so
  server.scc carries the card's cla_byte/sel_ctrl from startup on.
- _verify_adm prefers app.rs.lchan[0].scc / app.card._scc, exactly like
  pySim-shell's verify_adm, independent of server.scc.
- netsim AUTHENTICATE follows the card class: a UICC gets 00 88 00 81 22
  (RAND+AUTN, DB/DC response), a SIM gets A0 88 00 00 10 (RAND only,
  SRES+Kc); the 61xx GET RESPONSE uses the same CLA.
- tests: ADM with a stale placeholder scc; 2G builder/parser; SIM-CLA
  runner case; help EN/RU and AGENTS updated.

pysim_simple_server/__main__.py

@@ -138,6 +138,11 @@ def main():
                 sys.stderr.write('INIT: no card in the reader — server ready; insert a card or press Equip\n')
         _tlog('card_init: %.0fms' % ((time.time() - t_phase) * 1000))
         if card is not None:
+            # Fast init builds the card on its own SimCardCommands instance;
+            # adopt it so server.scc carries the card's cla_byte/sel_ctrl (the
+            # placeholder created above is a different object left at the SIM
+            # defaults, which made VERIFY go out with CLA A0 on a UICC).
+            scc = card._scc
             scc.cat_cla = '80' if isinstance(card, UiccCardBase) else 'a0'
     except Exception:
         print("Warning: reader/card initialization failed:", file=sys.stderr)