fix(infra): install leptonica/tesseract dev libs for tesseract feature build

Co-Authored-By: Kilo <kilo@kilo.ai>

infra/docker/tools.Dockerfile

@@ -2,6 +2,9 @@
 # Stage 1: Build Rust Backend (with cargo-chef caching)
 # ============================================================
 FROM lukemathwalker/cargo-chef:latest-rust-1.89.0 AS chef
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libleptonica-dev libtesseract-dev clang pkg-config \
+    && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
 
 FROM chef AS planner
@@ -9,6 +12,10 @@ COPY apps/tools/backend/ .
 RUN cargo chef prepare --recipe-path recipe.json
 
 FROM chef AS builder
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libleptonica-dev libtesseract-dev clang pkg-config \
+    && rm -rf /var/lib/apt/lists/*
+
 COPY --from=planner /app/recipe.json recipe.json
 RUN --mount=type=cache,target=/usr/local/cargo/registry \
     --mount=type=cache,target=/app/target \
@@ -44,6 +51,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     tesseract-ocr \
     tesseract-ocr-eng \
     tesseract-ocr-ind \
+    tesseract-ocr-osd \
     ca-certificates \
     fonts-dejavu-core \
     && rm -rf /var/lib/apt/lists/*