Add multi-schema support and per-base libraries

- Swap MST/BCK and MTH/ATC button positions
- Add schema support for different PostgreSQL schemas:
  - secretaria_clara: atc, mst, bck
  - production_alfred: mth
  - mail_manager: mail
  - context_manager: chat
- Libraries now load per-base (library_{base})
- Add new base types: key, mindlink
- Update FetchOptions to use schema instead of headers

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

deck-frontend/index.html

@@ -22,6 +22,7 @@
         <button class="btn btn-sm" id="btn-get">GET</button>
       </div>
       <div class="topbar-center">
+        <!-- Taxonomía -->
         <div class="base-buttons">
           <button class="base-btn active" data-base="hst">HST</button>
           <button class="base-btn" data-base="flg">FLG</button>
@@ -29,6 +30,26 @@
           <button class="base-btn" data-base="loc">LOC</button>
           <button class="base-btn" data-base="ply">PLY</button>
         </div>
+        <!-- Maestros -->
+        <div class="base-buttons">
+          <button class="base-btn" data-base="mst">MST</button>
+          <button class="base-btn" data-base="bck">BCK</button>
+        </div>
+        <!-- Registro -->
+        <div class="base-buttons">
+          <button class="base-btn" data-base="mth">MTH</button>
+          <button class="base-btn" data-base="atc">ATC</button>
+        </div>
+        <!-- Comunicación -->
+        <div class="base-buttons">
+          <button class="base-btn" data-base="mail">MAIL</button>
+          <button class="base-btn" data-base="chat">CHAT</button>
+        </div>
+        <!-- Servicios -->
+        <div class="base-buttons">
+          <button class="base-btn" data-base="key">KEY</button>
+          <button class="base-btn" data-base="mindlink">MIND</button>
+        </div>
       </div>
       <div class="topbar-right">
         <div class="search-box">