chore: pin chain-module-sdk v0.3.0 and switch to #[chain_module]

The pre-rename #[fai_module] attribute is gone in SDK 0.3.0; the
dependency is tag-pinned so an SDK push can no longer change what
this module builds against. Rebuilt artifact where tracked.

Signed-off-by: flemming-it <sf@flemming.it>

src/lib.rs

@@ -80,7 +80,7 @@ struct BoundingBox {
     height: f64,
 }
 
-#[fai_module]
+#[chain_module]
 pub fn invoke(_ctx: Context, inputs: Inputs) -> Result<Outputs, ModuleError> {
     let bytes = inputs.require_bytes("document")?;
     let extracted = match bytes.mime_type.as_str() {