feat: Enhance dependency management and project setup

- Added support for registry-based dependencies in the dependencies section.
- Updated the package section to include a project type field.
- Introduced a new CLI command `dcr setup` to load and display registry configurations.
- Implemented a new module for handling registry operations, including loading and resolving packages from registries.
- Enhanced the build process to handle library packaging, including copying headers and libraries to the appropriate target directories.
- Updated the CLI to support building library packages and added tests for library package builds.
- Improved error handling and output messages during dependency resolution and package fetching.

src/cli/setup.rs

@@ -0,0 +1,16 @@
+pub fn setup(_args: &[String]) -> i32 {
+    println!("Setting up DCR registries...");
+    match crate::core::registry::RegistryManager::load() {
+        Ok(manager) => {
+            println!("Loaded {} registries.", manager.config.registry.len());
+            for (name, reg) in manager.config.registry {
+                println!("- {}: {} (priority {})", name, reg.url, reg.priority);
+            }
+            0
+        }
+        Err(e) => {
+            println!("Error: {}", e);
+            1
+        }
+    }
+}