style: improve code formatting; refactor module imports

- Apply consistent alignment for struct fields and parameters
- Standardize string literal delimiters to single quotes
- Refactor module import strategy in `models` package
- Enhance asset formatting for precise decimal display
- Remove unused imports and redundant `+}` syntax artifacts

examples/clients/zinit_rpc.vsh

@@ -52,7 +52,6 @@ println('  - API title: ${spec.info.title}')
 println('  - API version: ${spec.info.version}')
 println('  - Methods available: ${spec.methods.len}')
 
-
 // 2. List all services
 println('\n2. Listing all services...')
 services := client.service_list() or {