chore(build): pin chain-module-sdk v0.3.0 and adopt #[chain_module]

SDK 0.3.0 drops the fai-legacy #[fai_module] alias; pin the tag and
flip the attribute, rebuilt module.wasm accordingly.

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

src/lib.rs

@@ -12,7 +12,7 @@ mod llm;
 
 use chain_module_sdk::prelude::*;
 
-#[fai_module]
+#[chain_module]
 pub fn invoke(_ctx: Context, inputs: Inputs) -> Result<Outputs, ModuleError> {
     let prompt = inputs.require_text("prompt")?.to_string();
     let endpoint = inputs.require_text("endpoint")?.to_string();