docs: update license to GPL-3.0-or-later in metadata and documentation

Author: nerdCopter

Cargo.toml

@@ -3,7 +3,7 @@ name = "bbl_parser"
 version = "0.9.0"
 edition = "2021"
 authors = ["nerdCopter"]
-license = "AGPL-3.0"
+license = "GPL-3.0-or-later"
 description = "Parser for Betaflight/EmuFlight/INAV blackbox log files"
 keywords = ["betaflight", "blackbox", "drone", "flight-log", "parser"]
 categories = ["parsing", "aerospace"]

README.md

@@ -501,7 +501,7 @@ The GitHub Actions CI enforces strict formatting and code quality:
 
 ## License
 
-This project is provided as-is for educational and development use with flight controller blackbox logs.  
+This project is licensed under GPL-3.0-or-later.
 
 ## Acknowledgments