Add Perfana TimescaleDB Backend Listener (#847)

* Add Perfana TimescaleDB Backend Listener

* Move Perfana TimescaleDB entry into various.json

Address review on #847: community plugin entries belong in the existing
site/dat/repo/various.json array rather than a new descriptor file. Drop
perfana.json and append the entry, normalized to 2-space indentation with
a trailing newline (passes python3 format_repo.py --check).

---------

Co-authored-by: Daniel Moll <dmoll1974@gmail.com>

Author: DanielPerfana

site/dat/repo/various.json

@@ -3439,5 +3439,26 @@
         "libs": {}
       }
     }
+  },
+  {
+    "id": "perfana-timescaledb",
+    "name": "Perfana TimescaleDB Backend Listener",
+    "description": "JMeter backend listener that writes test results directly to TimescaleDB for real-time performance analysis. Batch writing, HikariCP pooling, backpressure handling, URL normalization, and synthetic-monitoring mode.",
+    "screenshotUrl": "https://raw.githubusercontent.com/perfana/perfana-jmeter-timescaledb/main/docs/images/jmeter-backend-listener.png",
+    "helpUrl": "https://github.com/perfana/perfana-jmeter-timescaledb",
+    "vendor": "Perfana",
+    "markerClass": "io.perfana.jmeter.timescaledb.JMeterTimescaleDBBackendListenerClient",
+    "componentClasses": [
+      "io.perfana.jmeter.timescaledb.JMeterTimescaleDBBackendListenerClient"
+    ],
+    "versions": {
+      "1.0.4": {
+        "downloadUrl": "https://repo1.maven.org/maven2/io/perfana/perfana-jmeter-timescaledb/1.0.4/perfana-jmeter-timescaledb-1.0.4.jar",
+        "libs": {
+          "postgresql>=42.7.4": "https://repo1.maven.org/maven2/org/postgresql/postgresql/42.7.4/postgresql-42.7.4.jar",
+          "HikariCP>=5.1.0": "https://repo1.maven.org/maven2/com/zaxxer/HikariCP/5.1.0/HikariCP-5.1.0.jar"
+        }
+      }
+    }
   }
 ]