fix: anonymize personal data in documentation and test files

- Remove personal email address from SOURCE-SELECTION.md examples
- Replace real device ID (08DF1F0BA325) with anonymized ID (1234567890AB)
- Replace real device name 'A Sound Machine' with 'My SoundTouch Device'
- Anonymize MAC addresses in test data files
- Update IP addresses in examples to use generic 192.168.1.x
- Keep designated test endpoints in CLAUDE.md as they are project-specific
- Ensure all test files use anonymized data while maintaining functionality
- All tests still pass after anonymization changes

docs/SOURCE-SELECTION.md

@@ -145,7 +145,7 @@ soundtouch-cli -host 192.168.1.100 -aux
 soundtouch-cli -host 192.168.1.100 -sources
 
 # Select Spotify with account
-soundtouch-cli -host 192.168.1.100 -spotify -source-account "user_account"
+soundtouch-cli -host 192.168.1.100 -spotify -source-account "your_account"
 
 # Select TuneIn
 soundtouch-cli -host 192.168.1.100 -select-source TUNEIN
@@ -185,12 +185,12 @@ soundtouch-cli -host 192.168.1.100 -sources
 This shows account names for each source:
 ```
 Ready Sources:
-  • user+spotify@example.com (user_account) [Remote, Multiroom, Streaming]
+  • user+spotify@example.com (user) [Remote, Multiroom, Streaming]
 ```
 
 In this example:
 - Full account: `user+spotify@example.com`
-- Short account: `user_account` (often works better)
+- Short account: `user` (often works better)
 
 ## Integration Examples
 

pkg/client/testdata/info_response_st20.xml

@@ -29,8 +29,8 @@
         <ipAddress>192.168.1.100</ipAddress>
     </networkInfo>
     <networkInfo type="SMSC">
-        <macAddress>08DF1F0BA32A</macAddress>
-        <ipAddress>192.168.1.100</ipAddress>
+        <macAddress>1234567890AC</macAddress>
+        <ipAddress>192.168.1.101</ipAddress>
     </networkInfo>
     <moduleType>scm</moduleType>
     <variant>spotty</variant>