Add [CHANNEL+1] placeholder support for Hikvision-style channel numbering

- Added [CHANNEL+1], [channel+1], {CHANNEL+1}, {channel+1} placeholders to builder.go
- Updated 14 camera brands with universal channel patterns
- Hikvision: replaced 10 hardcoded patterns with 6 universal patterns
- Hiwatch: replaced 4 hardcoded patterns with 8 universal patterns (including ISAPI)
- Other brands: Annke, Swann, Abus, 7links, LevelOne, AlienDVR, Oswoo, AV102IP-40, Acvil, TBKVision, Deltaco, Night Owl
- Universal patterns placed first for faster discovery, hardcoded patterns kept as fallback
- Supports both 0-based (channel=0 -> 101) and 1-based (channel=1 -> 101) numbering
- Added 6 high-priority patterns to popular_stream_patterns.json

data/popular_stream_patterns.json

@@ -31,6 +31,54 @@
     "notes": "Common RTSP sub stream for ONVIF cameras",
     "model_count": 9998
   },
+  {
+    "url": "/Streaming/Channels/[CHANNEL+1]01",
+    "type": "FFMPEG",
+    "protocol": "rtsp",
+    "port": 554,
+    "notes": "Hikvision main stream - 0-based channel input (channel 0 -> 101, 1 -> 201)",
+    "model_count": 9500
+  },
+  {
+    "url": "/Streaming/Channels/[CHANNEL]01",
+    "type": "FFMPEG",
+    "protocol": "rtsp",
+    "port": 554,
+    "notes": "Hikvision main stream - 1-based channel input (channel 1 -> 101, 2 -> 201)",
+    "model_count": 9490
+  },
+  {
+    "url": "/Streaming/Channels/[CHANNEL+1]02",
+    "type": "FFMPEG",
+    "protocol": "rtsp",
+    "port": 554,
+    "notes": "Hikvision sub stream - 0-based channel input (channel 0 -> 102, 1 -> 202)",
+    "model_count": 9480
+  },
+  {
+    "url": "/Streaming/Channels/[CHANNEL]02",
+    "type": "FFMPEG",
+    "protocol": "rtsp",
+    "port": 554,
+    "notes": "Hikvision sub stream - 1-based channel input (channel 1 -> 102, 2 -> 202)",
+    "model_count": 9470
+  },
+  {
+    "url": "/Streaming/Channels/[CHANNEL+1]03",
+    "type": "FFMPEG",
+    "protocol": "rtsp",
+    "port": 554,
+    "notes": "Hikvision third stream - 0-based channel input (channel 0 -> 103, 1 -> 203)",
+    "model_count": 9460
+  },
+  {
+    "url": "/Streaming/Channels/[CHANNEL]03",
+    "type": "FFMPEG",
+    "protocol": "rtsp",
+    "port": 554,
+    "notes": "Hikvision third stream - 1-based channel input (channel 1 -> 103, 2 -> 203)",
+    "model_count": 9450
+  },
   {
     "url": "/ch2",
     "type": "FFMPEG",