feat: reorganize examples and add signature support to JobBuilder

- Reorganized examples into osiris/, sal/, and utils/ folders
- Moved hardcoded scripts to separate .rhai files
- Added signature() method to JobBuilder for job signing
- Updated OSIRIS context to use block_in_place instead of runtime
- Removed runtime field from OsirisContext
- Added typed save() methods for Note and Event objects
- Updated all examples to use new structure and APIs

examples/sal/scripts/_archive/install_deb.rhai

@@ -0,0 +1,32 @@
+
+fn dragonfly(){
+    download("https://github.com/dragonflyoss/dragonfly/releases/download/v2.2.1/dragonfly-2.2.1-linux-amd64.tar.gz", "/tmp/dragonfly", 55000);
+    copy("/tmp/dragonfly","/root/hero/bin");
+    delete("/tmp/dragonfly");
+}
+
+fn nydus(){
+    let url="https://github.com/dragonflyoss/nydus/releases/download/v2.3.1/nydus-static-v2.3.1-linux-amd64.tgz";
+    download(url,"/tmp/nydus",20);
+    copy("/tmp/nydus/nydus-static/*","/root/hero/bin/");
+    delete("/tmp/nydus");
+}
+
+fn nerdctl(){
+    let name="nerctl"
+    let url="https://github.com/containerd/nerdctl/releases/download/v2.0.4/nerdctl-2.0.4-linux-amd64.tar.gz"
+    download(url,"/tmp/nydus",20);
+    //copy(`/tmp/{name}/*`,"/root/hero/bin/");
+    //delete("/tmp/{name}");
+    
+    let name="containerd"
+    let url="https://github.com/containerd/containerd/releases/download/v2.0.4/containerd-2.0.4-linux-amd64.tar.gz";
+    download(url,"/tmp/nydus",20);
+    //copy(`/tmp/{name}/*`,"/root/hero/bin/");
+    //delete("/tmp/{name}");
+
+}
+
+nydus();
+
+"done"