config(telemetry): use generic /var/log/xrpld path, drop personal home dir

Replace the hardcoded /home/pratik/xrpld-logs path with the conventional
/var/log/xrpld in the mainnet config's [debug_logfile], the docker-compose
log volume mount, and the collector-config comment. Removes a personal home
directory from shipped config.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker/telemetry/docker-compose.yml

@@ -37,10 +37,10 @@ services:
       # Mount collector pipeline config (receivers → processors → exporters)
       - ./otel-collector-config.yaml:/etc/otel-collector-config.yaml:ro
       # Phase 8: Mount rippled log directories for filelog receiver.
-      # User-run xrpld writes to /home/pratik/xrpld-logs/<network>/debug.log.
+      # User-run xrpld writes to /var/log/xrpld/<network>/debug.log.
       # Integration test still writes to /tmp/xrpld-integration/.
       # Both are mounted read-only so the collector can tail debug.log files.
-      - /home/pratik/xrpld-logs:/var/log/rippled:ro
+      - /var/log/xrpld:/var/log/rippled:ro
       - /tmp/xrpld-integration:/var/log/rippled-integration:ro
     depends_on:
       - tempo

docker/telemetry/otel-collector-config.yaml

@@ -36,7 +36,7 @@ receivers:
   # trace_id, span_id, message) via regex. The trace_id and span_id are
   # optional — only present when the log was emitted within an active span.
   filelog:
-    # Tails both user-run xrpld logs (/home/pratik/xrpld-logs/...)
+    # Tails both user-run xrpld logs (/var/log/xrpld/...)
     # and integration-test logs (/tmp/xrpld-integration/...).
     include:
       - /var/log/rippled/*/debug.log

docker/telemetry/xrpld-telemetry-mainnet.cfg

@@ -95,7 +95,7 @@ docker/telemetry/data
 # --- Logging ----------------------------------------------------------------
 
 [debug_logfile]
-/home/pratik/xrpld-logs/mainnet/debug.log
+/var/log/xrpld/mainnet/debug.log
 
 [rpc_startup]
 { "command": "log_level", "severity": "debug" }