Tests: add live integration test (optional via PRIVATEBIN_IT), fix WinHTTP host/port + TLS opts, robust JSON parser (meta.time_to_live), CTest wiring; Add LLVM/clang-cl coverage option and docs; add build_thinkpad.bat; README updates

src/json_parser.cpp

@@ -105,8 +105,18 @@ bool JsonParser::parse_paste_json(const json& json_data,
             }
         }
         
-        // Extract expiration
-        expiration = json_data.at("meta").at("expire");
+        // Extract expiration; servers may return either meta.expire (string)
+        // or meta.time_to_live (integer seconds). Both are optional for our use.
+        try {
+            expiration = json_data.at("meta").at("expire");
+        } catch (...) {
+            try {
+                auto ttl = json_data.at("meta").at("time_to_live").get<int>();
+                expiration = std::to_string(ttl);
+            } catch (...) {
+                expiration.clear();
+            }
+        }
         
         return true;
     } catch (...) {