Mise à jour de la configuration Rust, documentation et dépendances

Migration vers Rust 2021, ajout de la documentation en français, mise à jour des dépendances et suppression des crates inutilisées.

- Mise à jour de l'édition Rust à 2021
- Ajout de commentaires de documentation en français
- Suppression des dépendances `quick-xml` et `xmltree`
- Ajout de nouvelles dépendances : `get_if_addrs`, `os_info`, `netstat2`, `sysinfo`, `users`
- Mise à jour du fichier README.md et LICENSE
- Correction de l'ordre des imports dans `src/process.rs`

AGENTS.md

@@ -3,6 +3,9 @@
 ## Build & Test Commands
 
 ```bash
+# Navigate to the utils directory first
+cd pmoutils
+
 # Build the library
 cargo build
 
@@ -28,10 +31,11 @@ cargo fmt
 ## Code Style Guidelines
 
 ### General
-- Rust 2024 edition
+- Rust 2021 edition
 - Follow official Rust style guide and Clippy recommendations
-- All code must be documented with Rustdoc comments
+- All code must be documented with Rustdoc comments (triple slash `///`)
 - Prefer `&str` over `String` for function parameters when possible
+- Use French documentation comments (match project convention)
 
 ### Imports
 - Group imports by source: std → external crates → crate modules
@@ -42,15 +46,26 @@ cargo fmt
 - Types: `PascalCase` (e.g., `ProcessPortInfo`, `TransportProtocol`)
 - Functions/methods: `snake_case` (e.g., `guess_local_ip`, `find_process_using_port`)
 - Constants: `SCREAMING_SNAKE_CASE`
-- Traits: prefix with `To` or descriptive noun (e.g., `ToXmlElement`)
 - Tests: `test_functionality_what_it_does` format
 
 ### Error Handling
 - Use `Option` for operations that may not return a value (e.g., `find_process_using_port` returns `Option<ProcessPortInfo>`)
-- Use `?` operator for propagating errors
+- Use `?` operator for propagating errors from fallible functions
 - Return default values (like `"127.0.0.1"`) only when appropriate fallback exists
 - Document error conditions in function documentation
 
+### Dependencies
+- `get_if_addrs`: Network interface address detection
+- `os_info`: Cross-platform OS version detection
+- `netstat2`: Network socket and process port mapping
+- `sysinfo`: Process and system information
+- `users`: User lookup by UID
+
+### Platform Support
+- Currently targets Unix-like systems (macOS, Linux)
+- Socket info retrieval uses netstat2 which may have limited Windows support
+- OS detection is cross-platform via os_info crate
+
 ### Types
 - Prefer concrete types over generics unless abstraction is needed
 - Use `u32` for PIDs, `u16` for ports
@@ -74,3 +89,15 @@ cargo fmt
 - Include tests for edge cases (e.g., fallback to localhost)
 - Verify return value formats and constraints
 - Test filtering: `cargo test --lib ip_utils::tests::test_list_all_ips_no_loopback`
+
+### Module Organization
+- `ip_utils.rs`: Network IP address utilities (detection, listing)
+- `process.rs`: Process and port information utilities
+- Export public functions at crate root in `lib.rs`
+- Group related functionality into modules with clear responsibilities
+
+### Additional Notes
+- The project uses French documentation comments throughout
+- Doctests are included and tested via `cargo test --doc`
+- Test helper functions (like `is_private_ip`) can be included in the tests module
+- Prefer explicit error handling with clear fallback behavior