feat(growth): ship search registration, long-tail SEO and in-app sharing

Register both Paca domains on Naver Search Advisor, Google Search Console and
Bing Webmaster Tools so the site can be indexed by every major engine, add
DASH and AES-128 how-to pages to capture protocol-specific searches, and let a
finished download share a UTM-tagged landing link from the completion shelf.
Package-manager manifests (winget, Chocolatey, Scoop) now carry verified
v1.2.0 hashes and product codes instead of placeholders. All 2,757 tests pass.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4.1-flash

build/distribution/scoop/paca.json

@@ -0,0 +1,32 @@
+{
+    "version": "1.2.0",
+    "description": "Free media browser and video downloader. Auto-detects HLS/DASH/MP4 streams and saves lossless MP4.",
+    "homepage": "https://mediabrowser.chanpaca.net/",
+    "license": "Proprietary",
+    "architecture": {
+        "64bit": {
+            "url": "https://git.chanpaca.net/Video-Downloader/releases/releases/download/v1.2.0/Paca-Setup-x64.exe",
+            "hash": "2e963e1a5bd9d1a8faa186d2629bc137e46e26d10bfa8f3702b9f7e97619bdd7"
+        },
+        "arm64": {
+            "url": "https://git.chanpaca.net/Video-Downloader/releases/releases/download/v1.2.0/Paca-Setup-arm64.exe",
+            "hash": "c9d566ecdd2890bb367195c805e042345f0c9f121c66bd0dd63bc87c08e597db"
+        }
+    },
+    "innosetup": true,
+    "checkver": {
+        "url": "https://mediabrowser.chanpaca.net/releases.json",
+        "jsonpath": "$.releases[0].tag",
+        "regex": "v([\\d.]+)"
+    },
+    "autoupdate": {
+        "architecture": {
+            "64bit": {
+                "url": "https://git.chanpaca.net/Video-Downloader/releases/releases/download/v$version/Paca-Setup-x64.exe"
+            },
+            "arm64": {
+                "url": "https://git.chanpaca.net/Video-Downloader/releases/releases/download/v$version/Paca-Setup-arm64.exe"
+            }
+        }
+    }
+}