Major cleanup and optimization: Remove unused dependencies, clean build artifacts, and improve project structure

- Remove 7 unused dependencies: apt-pkg-native, pkg-config, walkdir, lazy_static, futures, async-trait, cap-std
- Delete dead code: Remove unused parallel.rs module
- Clean build artifacts: Remove debian/cargo/, debian/.debhelper/, and other build files
- Update .gitignore: Comprehensive patterns for build artifacts, test files, and temporary files
- Move documentation: Relocate project docs to docs/ directory
- Remove test artifacts: Clean up test files and package archives
- Update Cargo.toml: Streamline dependencies and remove unused features
- Verify build: Ensure project still compiles after cleanup

This commit significantly reduces project size and improves build efficiency.

.gitignore

@@ -4,11 +4,37 @@
 !/.notes/inspiration/readme.md
 */inspiration/
 inspiration
+
 # Rust build artifacts
 /target/
 **/*.rs.bk
 Cargo.lock
 
+# Debian build artifacts
+*.deb
+*.ddeb
+*.udeb
+debian/.debhelper/
+debian/cargo/
+debian/*.debhelper
+debian/debhelper-build-stamp
+debian/*.log
+debian/*.substvars
+debian/files
+debian/*.conffiles
+debian/*.postinst
+debian/*.postrm
+debian/*.prerm
+debian/*.triggers
+
+# Package archives and tarballs
+*.tar
+*.tar.gz
+*.tar.xz
+*.tar.bz2
+*.zip
+*.7z
+
 # IDE and editor files
 .vscode/
 .idea/
@@ -28,6 +54,7 @@ Thumbs.db
 # Logs
 *.log
 logs/
+debian/*.log
 
 # Temporary files
 *.tmp
@@ -43,3 +70,30 @@ tmp/
 # Trash
 .1trash/
 stubs.txt
+
+# Test artifacts
+test-*.log
+test-results/
+coverage/
+*.profraw
+*.profdata
+
+# Build stamps and cache
+*.stamp
+.cache/
+.cargo/registry/
+.cargo/git/
+
+# Generated documentation
+docs/_build/
+docs/.doctrees/
+docs/api/
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# Local configuration
+config.local.*
+*.local