feat: migrate configuration from custom format to YAML

- Replace custom directive-based config parser with YAML using gopkg.in/yaml.v3
- Rename config.example.conf to config.example.yml with YAML syntax
- Update default config path to /etc/logcorrelator/logcorrelator.yml
- Update Dockerfile.package to copy YAML config files
- Update packaging scripts to install logcorrelator.yml
- Update architecture.yml to document YAML configuration
- Add yaml.v3 dependency to go.mod

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

config.example.yml

@@ -0,0 +1,45 @@
+# logcorrelator configuration file
+# Format: YAML
+
+service:
+  name: logcorrelator
+  language: go
+
+inputs:
+  unix_sockets:
+    - name: apache_source
+      path: /var/run/logcorrelator/apache.sock
+      format: json
+    - name: network_source
+      path: /var/run/logcorrelator/network.sock
+      format: json
+
+outputs:
+  file:
+    enabled: true
+    path: /var/log/logcorrelator/correlated.log
+
+  clickhouse:
+    enabled: false
+    dsn: clickhouse://user:pass@localhost:9000/db
+    table: correlated_logs_http_network
+    batch_size: 500
+    flush_interval_ms: 200
+    max_buffer_size: 5000
+    drop_on_overflow: true
+    async_insert: true
+    timeout_ms: 1000
+
+  stdout:
+    enabled: false
+
+correlation:
+  key:
+    - src_ip
+    - src_port
+  time_window:
+    value: 1
+    unit: s
+  orphan_policy:
+    apache_always_emit: true
+    network_emit: false