feat: podcast demo mode with ALWRITY_ENABLED_FEATURES support

- Add ALWRITY_ENABLED_FEATURES env var for feature gating
- Podcast-only mode: skip LLM bootstrap, scheduler, persona services
- Enhance video generation prompt with scene context, analysis, narration
- Add voice cloning support via custom_voice_id in WaveSpeed
- Add text-to-speech for research results (browser speechSynthesis)
- Fix render queue to sync images from script phase
- Add WaveSpeed LLM pricing (gpt-oss-120b)
- Fix podcast bible generation error handling
- Refactor RouterManager for feature-based router loading

frontend/src/components/PodcastMaker/AnalysisPanel/tabs/GuestTab.tsx

@@ -0,0 +1,36 @@
+import React from "react";
+import { Stack, Box, Typography, Chip, Paper } from "@mui/material";
+import { Quiz as TalkIcon } from "@mui/icons-material";
+import { PodcastAnalysis } from "../../types";
+import { AnalysisTabContent } from "../AnalysisTabNav";
+
+interface GuestTabProps {
+  analysis: PodcastAnalysis;
+}
+
+export const GuestTab: React.FC<GuestTabProps> = ({ analysis }) => {
+  if (!analysis.guest_talking_points || analysis.guest_talking_points.length === 0) {
+    return (
+      <AnalysisTabContent title="Guest Talking Points" icon={<TalkIcon />}>
+        <Typography variant="body2" sx={{ color: "#64748b" }}>
+          No guest talking points generated yet. Add a guest speaker to get interview questions.
+        </Typography>
+      </AnalysisTabContent>
+    );
+  }
+
+  return (
+    <AnalysisTabContent title="Guest Talking Points" icon={<TalkIcon />}>
+      <Stack spacing={2}>
+        {analysis.guest_talking_points.map((point: string, idx: number) => (
+          <Paper key={idx} elevation={0} sx={{ p: 2, bgcolor: "#faf5ff", border: "1px solid rgba(168,85,247,0.2)", borderRadius: 2, display: "flex", alignItems: "flex-start", gap: 1.5 }}>
+            <Chip label="Q" size="small" sx={{ minWidth: 24, bgcolor: "#a855f7", color: "#fff" }} />
+            <Typography variant="body2" sx={{ color: "#6b21a8" }}>
+              {point}
+            </Typography>
+          </Paper>
+        ))}
+      </Stack>
+    </AnalysisTabContent>
+  );
+};