Add English to Katakana and Romaji conversion support

Dockerfile

@@ -22,6 +22,12 @@ FROM oven/bun:latest AS runtime
 
 WORKDIR /app
 
+# Install MeCab for English to Katakana conversion
+RUN apt-get update && \
+    apt-get install -y mecab mecab-ipadic-utf8 libmecab-dev && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
 # Copy built application from builder stage
 COPY --from=builder /app .