Add character teleport, delete, and account kick/delete to admin panel

Traced how login placement actually works: CPlayer login placement
(Src/World Server/worldpackets.cpp:27, pakPlayer) calls
GetRespawnByID(Position->respawn), and Position->respawn is loaded
straight from characters.respawnid (playerdata.cpp:110). So setting
respawnid to a Src/World Server list_respawnzones.id is a real, live
lever over where a character logs in next -- not a vestigial column
(unlike characters.townid, which turned out to be dead: the only
other code path that reads it is commented-out dead code in
pakUserDied, superseded by CPlayer::RespawnPlayer which uses an
in-memory Position->saved instead).

Added to the character edit page: a teleport dropdown grouped by map,
populated from list_respawnzones, wired straight to respawnid (takes
effect on the character's next login same as other stat edits) and a
delete-character action. Added to the account edit page: delete
account (characters are kept) and a "reset online flag" action for
accounts stuck thinking they're still logged in after a crash.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

webadmin/templates/edit_character.html

@@ -4,7 +4,19 @@
 <div class="card" style="max-width:600px;">
   <h2 style="margin-top:0;">Charakter: {{ char.char_name }} <span class="badge ok">Account: {{ char.account_name }}</span></h2>
   <form method="post">
-    <div class="grid">
+    <label>Standort (wirkt beim nächsten Login)</label>
+    <select name="respawnid">
+      <option value="{{ char.respawnid }}">-- aktuell: Zone #{{ char.respawnid }} --</option>
+      {% for map, zones in zones_by_map.items() %}
+      <optgroup label="Map {{ map }}">
+        {% for z in zones %}
+        <option value="{{ z.id }}">Map {{ z.map }} - Zone #{{ z.id }} ({{ '%.0f' % z.x }}, {{ '%.0f' % z.y }})</option>
+        {% endfor %}
+      </optgroup>
+      {% endfor %}
+    </select>
+
+    <div class="grid" style="margin-top:12px;">
       {% for field in stat_fields %}
       <div>
         <label>{{ field.lstrip('_') }}</label>
@@ -20,4 +32,11 @@
     </div>
   </form>
 </div>
+<div class="card" style="max-width:600px;border-color:#5a2530;">
+  <h3 style="margin-top:0;color:var(--danger);">Gefahrenzone</h3>
+  <form method="post" action="{{ url_for('delete_character', char_id=char.id) }}"
+        onsubmit="return confirm('Charakter {{ char.char_name }} wirklich unwiderruflich löschen?');">
+    <button type="submit" style="background:var(--danger);">Charakter löschen</button>
+  </form>
+</div>
 {% endblock %}