Fix country prefix handling to not affect other plugins

Changed approach from modifying global GEOGRAPHIC_PATTERNS (which affects
all plugins using fuzzy_matcher.py) to adding a new optional parameter.

Changes:
- Reverted GEOGRAPHIC_PATTERNS to original US-only patterns
- Added new remove_country_prefix parameter to normalize_name() (default: False)
- Updated _clean_channel_name() to use remove_country_prefix=True by default
- Implemented smart prefix detection that avoids removing quality tags (HD, SD, UHD, FHD)
- Added fallback country prefix removal in basic cleaning code
- Updated README to clarify country code prefix handling approach

This ensures backward compatibility for other plugins while enabling
multi-country support for Stream-Mapparr.

README.md

@@ -215,9 +215,10 @@ The legacy format is still supported and uses a direct array:
    * Example: `UK_channels.json`
 
 4. **Country Code Prefix Handling**
-   * Stream names may be prefixed with country codes (e.g., `CA: CBC`, `UK BBC One`)
+   * Stream names may be prefixed with country codes (e.g., `CA: CBC`, `UK BBC One`, `USA News`)
    * The plugin automatically removes these prefixes during matching
-   * Supported formats: `CC:`, `CC `, `CCC:`, or `CCC ` (where C = letter)
+   * Supported formats: `CC:` or `CC ` (2-letter codes), `CCC:` or `CCC ` (3-letter codes)
+   * Smart detection avoids removing quality tags like HD, SD, UHD, FHD
 
 ### Tips for Better Matching