Tesla Fleet API: čtení SoC po příjezdu k wallboxu

- services/tesla_client.py: access token s cache + ROTACE refresh tokenu do
  ems.tesla_token (env jen seed — Tesla refresh token je jednorázový),
  vehicles → vehicle_data?endpoints=charge_state, 408 (spící auto) = tiché
  přeskočení, výběr vozidla dle VIN / jediného na účtu (VIN se auto-naučí)
- hook _patch_session_from_tesla v _on_ev_arrival: PŘED replanem doplní
  soc_at_connect_pct (+ target z charge_limit_soc) do otevřené session přes
  fn_ev_session_apply_patch (rozšířena o soc_at_connect_pct) — energii si
  odvodí fn_planning_site_context (SQL-first); selhání neblokuje replan
- V086: asset_vehicle.vin, api_type='tesla' pro tesla-my (Model Y, home-01),
  singleton ems.tesla_token; R__095: fn_tesla_token_get/upsert,
  fn_tesla_arrival_context, fn_vehicle_set_vin
- config: TESLA_CLIENT_ID/SECRET/REFRESH_TOKEN (prázdné = vypnuto)
- testy parserů; plná sada beze změny

Aktivace: env do /opt/ems-deploy/.env + recreate backendu (docs/tesla-fleet-api.md §Stav).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

db/routines/R__095_fn_tesla.sql

@@ -0,0 +1,80 @@
+-- Tesla Fleet API – DB vrstva (SQL-first): tokeny, kontext příjezdu, učení VIN.
+
+create or replace function ems.fn_tesla_token_get()
+returns jsonb
+language sql
+stable
+as $fn$
+  select coalesce(
+    (select jsonb_build_object(
+       'refresh_token', t.refresh_token,
+       'access_token', t.access_token,
+       'access_expires_at', t.access_expires_at,
+       'updated_at', t.updated_at
+     ) from ems.tesla_token t where t.id = 1),
+    '{}'::jsonb
+  );
+$fn$;
+
+create or replace function ems.fn_tesla_token_upsert(
+  p_refresh_token text,
+  p_access_token text,
+  p_access_expires_at timestamptz
+)
+returns void
+language sql
+as $fn$
+  insert into ems.tesla_token (id, refresh_token, access_token, access_expires_at, updated_at)
+  values (1, p_refresh_token, p_access_token, p_access_expires_at, now())
+  on conflict (id) do update set
+    refresh_token = excluded.refresh_token,
+    access_token = excluded.access_token,
+    access_expires_at = excluded.access_expires_at,
+    updated_at = now();
+$fn$;
+
+-- Kontext pro hook po příjezdu EV: vozidlo navázané na charger (default_charger_id)
+-- + otevřená session. NULL vehicle => nic nedělat.
+create or replace function ems.fn_tesla_arrival_context(
+  p_site_id int,
+  p_charger_code text
+)
+returns jsonb
+language sql
+stable
+as $fn$
+  select coalesce(jsonb_build_object(
+    'vehicle_id', v.id,
+    'api_type', v.api_type,
+    'vin', v.vin,
+    'battery_capacity_kwh', v.battery_capacity_kwh,
+    'session_id', s.id,
+    'soc_at_connect_pct', s.soc_at_connect_pct
+  ), '{}'::jsonb)
+  from ems.asset_ev_charger c
+  join ems.asset_vehicle v
+    on v.site_id = c.site_id and v.default_charger_id = c.id and v.active
+  left join lateral (
+    select es.id, es.soc_at_connect_pct
+    from ems.ev_session es
+    where es.charger_id = c.id and es.session_end is null
+    order by es.id desc
+    limit 1
+  ) s on true
+  where c.site_id = p_site_id and c.code = p_charger_code;
+$fn$;
+
+create or replace function ems.fn_vehicle_set_vin(
+  p_vehicle_id int,
+  p_vin text
+)
+returns void
+language sql
+as $fn$
+  update ems.asset_vehicle
+    set vin = p_vin
+    where id = p_vehicle_id and (vin is null or vin = '');
+$fn$;
+
+comment on function ems.fn_tesla_arrival_context is
+'Vozidlo + otevřená session pro charger (hook po příjezdu EV → Tesla SoC).';