feat: add license loading at startup from env var or file

- LicenseBeanConfig wires LicenseGate bean with startup validation
- Supports token from CAMELEER_LICENSE_TOKEN env var or CAMELEER_LICENSE_FILE path
- Falls back to open mode when no license or no public key configured
- Add license config properties to application.yml

cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/LicenseBeanConfig.java

@@ -0,0 +1,68 @@
+package com.cameleer3.server.app.config;
+
+import com.cameleer3.server.core.license.LicenseGate;
+import com.cameleer3.server.core.license.LicenseInfo;
+import com.cameleer3.server.core.license.LicenseValidator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+@Configuration
+public class LicenseBeanConfig {
+
+    private static final Logger log = LoggerFactory.getLogger(LicenseBeanConfig.class);
+
+    @Value("${license.token:}")
+    private String licenseToken;
+
+    @Value("${license.file:}")
+    private String licenseFile;
+
+    @Value("${license.public-key:}")
+    private String licensePublicKey;
+
+    @Bean
+    public LicenseGate licenseGate() {
+        LicenseGate gate = new LicenseGate();
+
+        String token = resolveLicenseToken();
+        if (token == null || token.isBlank()) {
+            log.info("No license configured — running in open mode (all features enabled)");
+            return gate;
+        }
+
+        if (licensePublicKey == null || licensePublicKey.isBlank()) {
+            log.warn("License token provided but no public key configured (CAMELEER_LICENSE_PUBLIC_KEY). Running in open mode.");
+            return gate;
+        }
+
+        try {
+            LicenseValidator validator = new LicenseValidator(licensePublicKey);
+            LicenseInfo info = validator.validate(token);
+            gate.load(info);
+        } catch (Exception e) {
+            log.error("Failed to validate license: {}. Running in open mode.", e.getMessage());
+        }
+
+        return gate;
+    }
+
+    private String resolveLicenseToken() {
+        if (licenseToken != null && !licenseToken.isBlank()) {
+            return licenseToken;
+        }
+        if (licenseFile != null && !licenseFile.isBlank()) {
+            try {
+                return Files.readString(Path.of(licenseFile)).trim();
+            } catch (Exception e) {
+                log.warn("Failed to read license file {}: {}", licenseFile, e.getMessage());
+            }
+        }
+        return null;
+    }
+}

cameleer3-server-app/src/main/resources/application.yml

@@ -41,6 +41,11 @@ cameleer:
     debounce-ms: ${CAMELEER_INDEXER_DEBOUNCE_MS:2000}
     queue-size: ${CAMELEER_INDEXER_QUEUE_SIZE:10000}
 
+license:
+  token: ${CAMELEER_LICENSE_TOKEN:}
+  file: ${CAMELEER_LICENSE_FILE:}
+  public-key: ${CAMELEER_LICENSE_PUBLIC_KEY:}
+
 security:
   access-token-expiry-ms: 3600000
   refresh-token-expiry-ms: 604800000