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/functions/backend/db/extensions/parse-mcp-server-row.ts

@@ -0,0 +1,33 @@
+import type { BUN_SQLITE_COBBLE_MCP_SERVERS } from "@/db/types/db";
+import type { McpServerStatus, McpTransport } from "@/src/dict/mcp-dict";
+import type { McpServerRecord, McpToolInfo } from "@/src/types";
+import parseJsonColumn from "./parse-json-column";
+
+type Params = {
+    row: BUN_SQLITE_COBBLE_MCP_SERVERS;
+};
+
+/**
+ * An `mcp_servers` row with its JSON columns read.
+ */
+export default function parseMcpServerRow({ row }: Params): McpServerRecord {
+    return {
+        id: Number(row.id),
+        name: row.name || "",
+        slug: row.slug || "",
+        description: row.description || "",
+        transport: (row.transport || "remote") as McpTransport,
+        url: row.url || "",
+        headers: parseJsonColumn<Record<string, string>>({ text: row.headers, fallback: {} }),
+        command: row.command || "",
+        setup_command: row.setup_command || "",
+        env: parseJsonColumn<Record<string, string>>({ text: row.env, fallback: {} }),
+        excluded_tools: parseJsonColumn<string[]>({ text: row.excluded_tools, fallback: [] }),
+        tools: parseJsonColumn<McpToolInfo[]>({ text: row.tools_cache, fallback: [] }),
+        all_bots: row.all_bots == 1,
+        enabled: row.enabled != 0,
+        status: (row.status || "untested") as McpServerStatus,
+        last_error: row.last_error || "",
+        last_synced_at: typeof row.last_synced_at == "number" ? row.last_synced_at : null,
+    };
+}