Make port configurable (default 5100)

- Port now set via config.json "port" field
- Aggregator reads PORT from environment variable
- Updated all docs and scripts to use port 5100

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -31,7 +31,7 @@ pip install -r requirements.txt
 python kao.py
 ```
 
-UI available at http://localhost:5000
+UI available at http://localhost:5100
 
 ## Configuration
 
@@ -39,7 +39,7 @@ Edit `config.json` to configure detectors:
 
 ```json
 {
-  "aggregator_url": "http://localhost:5000",
+  "aggregator_url": "http://localhost:5100",
   "aggregator": { "script": "aggregator.py" },
   "detectors": [
     {