UI: pull version from /api/status instead of hardcoding it

The sidebar tag was a literal "v0.0.3" string in index.html, so a
release bump left the running UI lying about which build it was. Server
now publishes PATCHDL_VERSION via /api/status; renderStatus() drops it
into a #brandVersion span. No more chasing a hardcoded version on every
release.

src/patchdl_websrv.c

@@ -6,6 +6,7 @@
 #include "patchdl_net.h"
 #include "patchdl_resolve.h"
 #include "patchdl_verxml.h"
+#include "patchdl_version.h"
 
 #include <microhttpd.h>
 #include <pthread.h>
@@ -585,8 +586,9 @@ build_status_json(void) {
              "\"dns_guard\":\"Active\","
              "\"resolver\":\"Internal allowlist\","
              "\"free_space_mb\":%lld,"
-             "\"download_dir\":\"/data/patchdl (internal)\"}",
-             g_fw.str, g_fw.bin, data_free_mb());
+             "\"download_dir\":\"/data/patchdl (internal)\","
+             "\"version\":\"%s\"}",
+             g_fw.str, g_fw.bin, data_free_mb(), PATCHDL_VERSION);
     return out;
 }
 

web/app.js

@@ -127,6 +127,7 @@ function bindElements() {
     connPlus: document.getElementById("connPlus"),
     refreshBtn: document.getElementById("refreshBtn"),
     updateAllBtn: document.getElementById("updateAllBtn"),
+    brandVersion: document.getElementById("brandVersion"),
     saveBtn: document.getElementById("saveBtn"),
     clearLogBtn: document.getElementById("clearLogBtn"),
     toast: document.getElementById("toast"),
@@ -240,6 +241,8 @@ function renderStatus() {
   els.downloadDirValue.textContent = state.status.download_dir || state.config.download_dir || "Download target";
   if (els.railFw) els.railFw.textContent = `FW ${state.status.firmware || "--"}`;
   if (els.railSpace) els.railSpace.textContent = `${space} free`;
+  if (els.brandVersion)
+    els.brandVersion.textContent = state.status.version ? `v${state.status.version}` : "v--";
 }
 
 const CONN_MIN = 1, CONN_MAX = 16;

web/index.html

@@ -39,7 +39,7 @@
           <div class="brand-mark">PD</div>
           <div>
             <strong>PatchDL</strong>
-            <span>by Knutwurst · v0.0.3</span>
+            <span>by Knutwurst · <span id="brandVersion">--</span></span>
           </div>
         </div>