refactor: centralize path handling with XDG Base Directory compliance

- Add src/paths.rs module for all XDG path lookups
- Move scripts from ~/.config to ~/.local/share (XDG data)
- Use $XDG_CONFIG_HOME for browser bookmark paths
- Add dev-logging feature flag for verbose debug output
- Add dev-install profile for testable release builds
- Remove CLAUDE.md from version control

BREAKING: Scripts directory moved from
~/.config/owlry/scripts/ to ~/.local/share/owlry/scripts/

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/main.rs

@@ -3,6 +3,7 @@ mod cli;
 mod config;
 mod data;
 mod filter;
+mod paths;
 mod providers;
 mod theme;
 mod ui;
@@ -11,11 +12,26 @@ use app::OwlryApp;
 use cli::CliArgs;
 use log::{info, warn};
 
+#[cfg(feature = "dev-logging")]
+use log::debug;
+
 fn main() {
-    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
+    let default_level = if cfg!(feature = "dev-logging") { "debug" } else { "info" };
+
+    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or(default_level))
+        .format_timestamp_millis()
+        .init();
 
     let args = CliArgs::parse_args();
 
+    #[cfg(feature = "dev-logging")]
+    {
+        debug!("┌─────────────────────────────────────────┐");
+        debug!("│  DEV-LOGGING: Verbose output enabled    │");
+        debug!("└─────────────────────────────────────────┘");
+        debug!("CLI args: {:?}", args);
+    }
+
     info!("Starting Owlry launcher");
 
     // Diagnostic: log critical environment variables