Initial project skeleton (M0)

Add SPECS.md, JSON config loader with env overrides and validation,
and an empty tview shell with tabs and status bar.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

config.example.json

@@ -0,0 +1,21 @@
+{
+  "radarr": {
+    "url": "http://localhost:7878",
+    "apikey": "YOUR_RADARR_API_KEY",
+    "default_quality_profile": "HD-1080p",
+    "default_root_folder": "/movies"
+  },
+  "sonarr": {
+    "url": "http://localhost:8989",
+    "apikey": "YOUR_SONARR_API_KEY",
+    "default_quality_profile": "HD-1080p",
+    "default_root_folder": "/tv"
+  },
+  "sabnzbd": {
+    "url": "http://localhost:8080",
+    "apikey": "YOUR_SABNZBD_API_KEY"
+  },
+  "ui": {
+    "refresh_seconds": 3
+  }
+}