Add MCP servers and custom tools for bots

Two new settings pages, MCPs and Tools. Super admins define them; super
admins and admins attach them to bots, to workspaces (every bot there),
or to every bot. Bots get them in chat replies and tasks.

- Custom tools: a JSON-schema of arguments plus an HTTP request, a script
  on the bot's computer, or a prompt, templated with {{args.x}} and
  {{env.KEY}}, secrets redacted from results.
- MCP servers: remote (URL and headers) or stdio commands run on the host
  with a setup command and an isolated env, in a per-process pool. Tools
  are listed into a cache and connect on first call.
- Add, edit, access and try open in modals.
- Markdown, JSON and command fields use twui's AceEditor (CodeEditor),
  its scripts loaded on demand.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/utils/parse-template-lines.ts

@@ -0,0 +1,35 @@
+type Params = {
+    text: string;
+    /**
+     * What separates a name from its value: `:` for headers, `=` for envs.
+     */
+    separator: ":" | "=";
+};
+
+/**
+ * Reads one `Name: value` (or `NAME=value`) per line into a map, for the
+ * header and env fields of an MCP server or tool. Blank lines and lines
+ * without the separator are skipped; the value is everything after the
+ * first one, trimmed.
+ */
+export default function parseTemplateLines({ text, separator }: Params): Record<string, string> {
+    const map: Record<string, string> = {};
+
+    for (const line of text.split("\n")) {
+        const at = line.indexOf(separator);
+        const name = at > 0 ? line.slice(0, at).trim() : "";
+
+        if (name) map[name] = line.slice(at + 1).trim();
+    }
+
+    return map;
+}
+
+/**
+ * The other way: a map as one `Name: value` (or `NAME=value`) per line.
+ */
+export function templateLines({ map, separator }: { map?: Record<string, string>; separator: ":" | "=" }) {
+    return Object.entries(map || {})
+        .map(([name, value]) => `${name}${separator == ":" ? ": " : "="}${value}`)
+        .join("\n");
+}