fix(ci): copy templates/ for compile-time include_str

Dockerfile

@@ -10,10 +10,11 @@ RUN apt-get update && apt-get install -y \
     g++ \
     && rm -rf /var/lib/apt/lists/*
 
-# Copy manifests and source
+# Copy manifests, source, and compile-time assets
 COPY Cargo.toml Cargo.lock ./
 RUN mkdir -p src && echo '// workspace root' > src/lib.rs
 COPY crates ./crates
+COPY templates ./templates
 
 # Build release binary
 RUN cargo build --release -p mem-cli --bin mem