Fix S3 streams path, segment cleanup, and config reload

- Fix S3 list objects API path (add leading slash)
- Delete segment_msg_count when removing empty segments
- Check segment-specific message count in produce_metadata
- Call reload_logger after parsing all config sources
- Add S3 storage config example to lavinmq.ini

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: viktorerlingsson

extras/lavinmq.ini

@@ -28,3 +28,12 @@ bind = ::
 ;port = 5679
 ;advertised_uri = tcp://hostname.local:5679
 ;etcd_endpoints = localhost:2379
+
+[s3-storage]
+;enabled = false
+;region = eu-north-1
+; Use virtual-hosted-style URL with bucket in hostname:
+;endpoint = https://my-bucket.s3.eu-north-1.amazonaws.com
+;access_key_id = AKIAIOSFODNN7EXAMPLE
+;secret_access_key = wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
+;local_segments_per_stream = 50

src/lavinmq/amqp/stream/s3_message_store.cr

@@ -85,6 +85,7 @@ module LavinMQ::AMQP
             @log.debug { "Deleting empty segment #{seg} from local storage" }
             delete_file(mfile)
             @segments.delete(seg)
+            @segment_msg_count.delete(seg)
           else
             @replicator.try &.register_file mfile
             segments << {seg, mfile}

src/lavinmq/amqp/stream/s3_storage_client.cr

@@ -28,7 +28,7 @@ module LavinMQ::AMQP
 
       loop do
         begin
-          path = "?delimiter=%2F&encoding-type=url&list-type=2&prefix=#{prefix}&max-keys=1000"
+          path = "/?delimiter=%2F&encoding-type=url&list-type=2&prefix=#{prefix}&max-keys=1000"
           if token = continuation_token
             path += "&continuation-token=#{URI.encode_path(token)}"
           end

src/lavinmq/amqp/stream/stream_message_store.cr

@@ -367,7 +367,7 @@ module LavinMQ::AMQP
 
     private def produce_metadata(seg, mfile)
       super
-      if empty?
+      if @segment_msg_count[seg].zero?
         @segment_first_offset[seg] = @last_offset + 1
         @segment_first_ts[seg] = RoughTime.unix_ms
         @segment_last_ts[seg] = RoughTime.unix_ms

src/lavinmq/config/options.cr

@@ -320,7 +320,7 @@ module LavinMQ
       @[IniOpt(ini_name: session_token, section: "s3-storage")]
       property streams_s3_storage_session_token : String? = nil
 
-      @[CliOpt("", "--s3-storage-endpoint=ENDPOINT", "S3 endpoint URL", section: "s3-storage")]
+      @[CliOpt("", "--s3-storage-endpoint=ENDPOINT", "S3 endpoint URL (use virtual-hosted-style: https://bucket.s3.region.amazonaws.com)", section: "s3-storage")]
       @[IniOpt(ini_name: endpoint, section: "s3-storage")]
       property streams_s3_storage_endpoint : String? = nil