v0.35.1: performance, AGPL licensing and documentation overhaul

- Web Server reads static files inline; proxy middleware chain flattened
- About window with license summary and project links; AGPL-3.0-or-later
- Rewritten documentation: feature list, screenshots, performance guide
- Fix false spikes in per-Vhost request-rate charts

src/admin/web/app/config-history.js

@@ -21,8 +21,7 @@ function syncConfigHistoryRestoreButton() {
     button.hidden = configHistorySelectedRevision === null;
     button.disabled = busy || !envelope || !Number.isSafeInteger(revision) || revision >= Number(envelope.revision);
 }
-// Compare leaf fields, not serialized object/array blobs. Object IDs are used
-// for stable array paths so reordering vhosts does not become a huge fake diff.
+// Leaf-level diff keyed by object IDs, so reordering is not a change.
 function configDiff(before, after, path = "$", output = [], depth = 0) {
     if (output.length >= 200 || Object.is(before, after)) return output;
     if (depth >= 24) {

src/admin/web/app/dashboard-layout-editor.js

@@ -144,9 +144,7 @@ window.rustProxyDashboardLayout = (() => {
             widen.addEventListener("click", () => resize(id, 1));
             const widthValue = el("span", `${width}/12`, "overview-layout-width-value");
             widthValue.title = t("overviewLayoutWidth");
-            // The visual editor intentionally keeps uniformly sized previews.
-            // Group sizing separately from ordering/hiding so both sets wrap
-            // inside a narrow dialog rather than spilling into adjacent tiles.
+            // Size and order controls are grouped separately so they wrap in narrow dialogs.
             const sizeActions = el("span", undefined, "overview-layout-size-actions");
             sizeActions.append(narrow, widthValue, widen);
             const orderActions = el("span", undefined, "overview-layout-order-actions");

src/admin/web/app/rate-sampling.js

@@ -1,6 +1,4 @@
-// One continuity policy for all browser-side counter-derived rates.
-// Background tabs cannot supply a valid instantaneous rate for an interval
-// spanning the pause. Keep the plotted history and rebase on the next sample.
+// Shared rate sampling: rebase after background-tab pauses instead of plotting a false spike.
 const rustProxyRateSampling = (() => {
     let generation = 0;
     const pause = () => { generation += 1; };
@@ -19,6 +17,10 @@ const rustProxyRateSampling = (() => {
             at - previous.at <= Math.max(10000, seconds * 3000));
     }
     function difference(previous, values, at, intervalSeconds = 3) {
+        if (previous && previous.generation === generation && Number.isFinite(at) &&
+            Number.isFinite(previous.at) && at >= previous.at && at - previous.at < 250) {
+            return { next: previous, deltas: null, seconds: null, rapid: true };
+        }
         const next = { ...stamp(at), values: [...values] };
         if (!continuous(previous, at, intervalSeconds) ||
             values.some((value, i) => !Number.isFinite(value) || value < 0 ||