feat: add Spigot event producer

src/main/resources/config.yml

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+# A human-readable stable name for this Minecraft server.
+server-name: "minecraft-server"
+
+# Generated once and persisted here when left empty. Do not copy the generated
+# value to another server; it is the stable identity used in CloudEvent source.
+server-id: ""
+
+ingest-url: "https://events.dmg.games/events"
+send-interval-seconds: 300
+snapshot-interval-seconds: 60
+http-timeout-seconds: 15
+
+batch:
+  max-events: 1000
+  # Leaves headroom below the ingest server's default 1 MiB request limit.
+  max-bytes: 900000
+
+# A send is also requested when either threshold is reached. This decision and
+# all HTTP/SQLite work happen on the outbox worker, never the server thread.
+dispatch-threshold:
+  events: 1000
+  bytes: 900000
+
+statistics:
+  # Statistic maps are partitioned before becoming CloudEvents.
+  chunk-json-bytes: 200000
+  # Maximum statistic/material/entity combinations read on the main thread per tick.
+  operations-per-tick: 1000

src/main/resources/plugin.yml

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+name: SpigotEventProducer
+version: '${version}'
+main: games.dmg.spigotevents.SpigotEventProducerPlugin
+api-version: '26.2'
+author: dmg.games
+description: Writes Minecraft CloudEvents to a durable outbox and delivers them to game-ingest-server.