fix(placeholder): rename SVG to bust Cloudflare cache

The new A-monogram placeholder shipped in d8ca8ff was correct in the
deployed container, but Cloudflare was serving the previous cached SVG
(cf-cache-status: HIT, last-modified from this morning) because the
account token doesn't carry Zone:Cache Purge scope, so we couldn't
issue an API purge.

Renaming the file to article-placeholder-v2.svg gives CF a fresh URL
to cache, sidestepping the missing-permission entirely. Updated all
6 referencing files (AppImage fallback, legacy-source FALLBACK_IMAGE
constants, FeaturedBento[FromDb], manufacturers/authors pages).

Old file (cached as the old wordmark) just becomes a dangling asset —
not referenced from anywhere, harmless.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/assets/images/article-placeholder-v2.svg

@@ -0,0 +1,42 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 630" preserveAspectRatio="xMidYMid slice">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0%" stop-color="#0F172A"/>
+      <stop offset="50%" stop-color="#1E3A8A"/>
+      <stop offset="100%" stop-color="#0F172A"/>
+    </linearGradient>
+    <radialGradient id="glow" cx="50%" cy="50%" r="60%">
+      <stop offset="0%" stop-color="#1D4ED8" stop-opacity="0.18"/>
+      <stop offset="100%" stop-color="#1D4ED8" stop-opacity="0"/>
+    </radialGradient>
+    <linearGradient id="tile" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#2563EB"/>
+      <stop offset="100%" stop-color="#1E3A8A"/>
+    </linearGradient>
+  </defs>
+
+  <!-- Background gradient -->
+  <rect width="1200" height="630" fill="url(#bg)"/>
+  <rect width="1200" height="630" fill="url(#glow)"/>
+
+  <!-- Brand-mark tile + A monogram, centered. Same geometry as AnimatedLogo. -->
+  <g transform="translate(420 175)">
+    <!-- Rounded tile (280x280, rx 62) with the brand gradient -->
+    <rect x="0" y="0" width="280" height="280" rx="62" ry="62" fill="url(#tile)"/>
+    <!-- Faint inner ring so the tile reads on dark bg -->
+    <rect x="3" y="3" width="274" height="274" rx="59" ry="59" fill="none" stroke="rgba(255,255,255,0.20)" stroke-width="3"/>
+    <!-- A — two strokes: left+right legs and crossbar. Same path as AnimatedLogo at 4.4x scale. -->
+    <path d="M 62 220 L 140 60 L 218 220"
+          fill="none" stroke="#FFFFFF" stroke-width="22"
+          stroke-linecap="round" stroke-linejoin="round"/>
+    <path d="M 92 158 L 188 158"
+          fill="none" stroke="#FFFFFF" stroke-width="18"
+          stroke-linecap="round"/>
+  </g>
+
+  <!-- Wordmark + tagline -->
+  <g transform="translate(600 525)" text-anchor="middle" font-family="system-ui, -apple-system, 'Segoe UI', sans-serif">
+    <text y="0" font-size="56" font-weight="700" fill="#FFFFFF" letter-spacing="-0.012em">AV BEAT</text>
+    <text y="34" font-size="14" font-weight="500" fill="#CBD5E1" letter-spacing="0.22em">INSIDE THE FUTURE OF PRO AV</text>
+  </g>
+</svg>