fix(ocr): allow configuring tesseract path

server/app.py

@@ -51,6 +51,7 @@ SETTINGS = {
     "exec_max_timeout_s": int(os.getenv("CLICKTHROUGH_EXEC_MAX_TIMEOUT_S", "120")),
     "exec_max_output_chars": int(os.getenv("CLICKTHROUGH_EXEC_MAX_OUTPUT_CHARS", "20000")),
     "exec_secret": os.getenv("CLICKTHROUGH_EXEC_SECRET", "").strip(),
+    "tesseract_cmd": os.getenv("CLICKTHROUGH_TESSERACT_CMD", "").strip(),
 }
 
 
@@ -301,6 +302,10 @@ def _import_ocr_libs():
         import pytesseract
         from pytesseract import Output
 
+        tesseract_cmd = SETTINGS["tesseract_cmd"]
+        if tesseract_cmd:
+            pytesseract.pytesseract.tesseract_cmd = tesseract_cmd
+
         return pytesseract, Output
     except Exception as exc:
         raise HTTPException(status_code=500, detail=f"ocr backend unavailable: {exc}") from exc