S8: main DRB bot optional end to end + owner-flow integration tests (server-26#225)

- Copy: picker, admin Servers/Streams/How-it-works, org Discord card, bot
  /help and the server-limit refusal no longer imply the DRB server bot is
  required; a radio bot alone is enough.
- Admin overview: per-server main_bot_present, radio_bots, linked_via,
  directory_source; Servers tab gets a Bots column.
- discord_web docstring: states the reversed "never calls Discord" rule
  (plan finding 5) and the optional server bot.
- Server bot directory cog: re-push (which drops C2's cached permission
  answers) on overwrite changes, role permission changes and role deletes.
- tests/test_discord_owner_flows.py: one-bot org (BYO bot, owner-set
  preferred, OAuth link, picker, start, reconciler) and full setup (server
  bot + 4 radio bots: placement, shared channel, every refusal explained),
  against a modelled Discord over httpx.MockTransport.
- storage.download_audio removed: no caller on main since #233.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

drb-frontend/components/discord/ServersPanel.tsx

@@ -8,8 +8,12 @@ import { DIM, Field, INPUT, Panel, Status, Table, TD } from "./ui";
 
 // Linked Discord servers = discord_guilds docs, plus any server that has had a
 // radio channel without being linked (it acts for DISCORD_UNLINKED_GUILD_ORG_ID).
-// Linking is PUT /discord/guilds/{id}/link (platform admin). The owner-side
-// "/drb link code:" flow is server-26#213 item 1 and is not built here.
+// Linking here is PUT /discord/guilds/{id}/link (platform admin, support).
+// Org owners link their own from Settings → Organization: "Connect a Discord
+// server" (a radio bot's OAuth invite, no DRB server bot needed) or a
+// /drb link code (needs the server bot) — server-26#213 item 1, #225.
+// The Bots column says which bots are in each server: the DRB server bot is
+// optional (server-26#225 S8), one radio bot is enough to stream.
 // Remove is DELETE /discord/guilds/{id}: its radio channels are stopped then
 // deleted, and the server is unlinked with no fallback org.
 
@@ -85,6 +89,30 @@ function LinkForm({
   );
 }
 
+// Which bots are in the server. The DRB server bot is optional (server-26#225):
+// "not there" is only a problem when no radio bot is either.
+function BotsCell({ guild }: { guild: DiscordGuild }) {
+  const radio = guild.radio_bots ?? [];
+  const main = guild.main_bot_present;
+  return (
+    <>
+      <div>
+        {radio.length > 0 ? (
+          <span title={radio.join(", ")}>
+            {radio.length} radio bot{radio.length === 1 ? "" : "s"}
+          </span>
+        ) : (
+          <span className={main ? DIM : "text-sev-moderate"}>no radio bot</span>
+        )}
+      </div>
+      <div className={DIM}>
+        DRB server bot: {main === true ? "present" : main === false ? "not there" : "never seen"}
+        {guild.directory_source === "radio_bot" && " · channels via radio bot"}
+      </div>
+    </>
+  );
+}
+
 type RemoveResult = { guild: string; streams: number; bots: { name: string; left: boolean; error: string | null }[] };
 
 function RemoveForm({
@@ -131,7 +159,7 @@ function RemoveForm({
         </span>
       </label>
       <p className="text-ink-muted">
-        The DRB bot itself stays in the Discord server until someone kicks it there.
+        The DRB server bot, if it is in the Discord server, stays until someone kicks it there.
       </p>
       {error && <p className="text-sev-major">{error}</p>}
       <div className="flex gap-2">
@@ -171,8 +199,9 @@ export function ServersPanel({
         fallback ? (
           <>
             <b className="text-ink">Unlinked servers act for {fallbackName}</b> (DISCORD_UNLINKED_GUILD_ORG_ID). Any
-            server the DRB bot is invited to can use that org&apos;s systems until it is linked here. Set the variable
-            to an empty string once every real server is linked.
+            server the DRB server bot is invited to can use that org&apos;s systems until it is linked here (a radio
+            bot alone never puts an unlinked server here). Set the variable to an empty string once every real server
+            is linked.
           </>
         ) : (
           <>Unlinked servers can&apos;t use radio commands until they are linked here.</>
@@ -189,14 +218,16 @@ export function ServersPanel({
               {removed.bots.map((b) => `${b.name} ${b.left ? "left" : `did not leave (${b.error ?? "unknown error"})`}`).join("; ")}.
             </>
           )}{" "}
-          The DRB bot is still in that Discord server until someone kicks it.
+          The DRB server bot, if it was there, stays in that Discord server until someone kicks it.
           <button className="ml-3 text-accent hover:underline" onClick={() => setRemoved(null)}>Dismiss</button>
         </div>
       )}
       {overview.guilds.length === 0 ? (
-        <p className="px-4 py-6 text-sm text-ink-muted">No Discord servers yet. Link one, or run a radio command in a server the DRB bot is in.</p>
+        <p className="px-4 py-6 text-sm text-ink-muted">
+          No Discord servers yet. Link one here, or an organization owner connects one under Settings → Organization.
+        </p>
       ) : (
-        <Table head={["Server", "Acts for", "Radio channels", "Linked", "Status", ""]}>
+        <Table head={["Server", "Acts for", "Bots", "Radio channels", "Linked", "Status", ""]}>
           {overview.guilds.flatMap((g) => {
             const row = (
               <tr key={g.guild_id}>
@@ -208,6 +239,9 @@ export function ServersPanel({
                   {g.acting_org_name || g.acting_org_id || <span className={DIM}>nobody</span>}
                   {!g.linked && g.acting_org_id && <div className={DIM}>fallback, not linked</div>}
                 </td>
+                <td className={TD}>
+                  <BotsCell guild={g} />
+                </td>
                 <td className={TD}>
                   {g.live_streams} / {max}
                 </td>
@@ -251,7 +285,7 @@ export function ServersPanel({
               return [
                 row,
                 <tr key={`${g.guild_id}-remove`}>
-                  <td colSpan={6} className="p-0 border-b border-line">
+                  <td colSpan={7} className="p-0 border-b border-line">
                     <RemoveForm
                       guild={g}
                       onCancel={() => setRemoving(null)}
@@ -269,7 +303,7 @@ export function ServersPanel({
             return [
               row,
               <tr key={`${g.guild_id}-edit`}>
-                <td colSpan={6} className="p-0 border-b border-line">
+                <td colSpan={7} className="p-0 border-b border-line">
                   <LinkForm overview={overview} guild={g} onDone={done} onCancel={() => setEditing(null)} />
                 </td>
               </tr>,

drb-frontend/components/discord/StreamsPanel.tsx

@@ -348,7 +348,8 @@ export function StreamsPanel({
       )}
       {overview.streams.length === 0 ? (
         <p className="px-4 py-6 text-sm text-ink-muted">
-          No radio channels yet. Start one here, or run <span className="font-mono">/join</span> in a linked Discord server.
+          No radio channels yet. Start one here or from a node&apos;s Discord radio panel, or run{" "}
+          <span className="font-mono">/join</span> where the DRB server bot is in a linked Discord server.
         </p>
       ) : (
         <Table head={["Server · channel", "Source", "Talkgroups", "Mode", "Desired → actual", "Bot", ""]}>