Normalize RustAPI workspace deps and fix microservices-advanced handlers

[Copilot]

Example builds were failing because manifests relied on workspace dependency inheritance without a valid workspace root and because several examples referenced non-existent path deps. The update establishes a proper workspace and aligns dependency versions so cargo check can resolve all examples.

• Workspace + dependency alignment

  • Added root workspace dependency entries for RustAPI crates.
  • Converted example Cargo.toml dependencies to workspace = true.
  • Standardized doc snippets to RustAPI 0.1 versions.

• microservices-advanced handler compatibility

  • Wrapped product list response in a schema-friendly struct.
  • Replaced raw string response with a typed response struct.

#[derive(Serialize, Schema)]
struct ProductList {
    products: Vec<Product>,
}

async fn get_products() -> Json<ProductList> {
    Json(ProductList { products: vec![/* ... */] })
}

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