docs: Add speed parameter to tag_colors.json.example

- Added speed field to default and tag entries
- Updated instructions with speed range info
- Added fast flash example tag
- Reference GUI tool in instructions

tag_colors.json.example

@@ -4,12 +4,15 @@
         "Map legacy keys to colors and effects",
         "Effects: 'solid', 'pulse', 'flash'",
         "Colors: [R, G, B] values 0-255",
-        "Run the portal client to discover tag legacy keys"
+        "Speed: 0.2 (very fast) to 3.0 (slow), 1.0 = normal",
+        "Run the portal client to discover tag legacy keys",
+        "Or use portal_config_gui.py for visual editing"
     ],
     
     "default": {
         "color": [0, 255, 255],
         "effect": "solid",
+        "speed": 1.0,
         "name": "Default"
     },
     
@@ -17,12 +20,20 @@
         "2168494570": {
             "color": [255, 180, 50],
             "effect": "pulse",
+            "speed": 1.5,
             "name": "Desert Theme"
         },
         "2151706826": {
             "color": [0, 255, 100],
             "effect": "solid",
+            "speed": 1.0,
             "name": "Forest Theme"
+        },
+        "1234567890": {
+            "color": [255, 0, 100],
+            "effect": "flash",
+            "speed": 0.5,
+            "name": "Fast Flash Example"
         }
     },