Scaffold cameleer3-server project structure

Multi-module Maven project (server-core + server-app) with Spring Boot 3.4.3,
Gitea CI workflow, and dependency on cameleer3-common from Gitea Maven registry.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project
+
+Cameleer3 Server — observability server that receives, stores, and serves Camel route execution data and route diagrams from Cameleer3 agents. Pushes config and commands to agents via SSE.
+
+## Related Project
+
+- **cameleer3** (`https://gitea.siegeln.net/claude/cameleer3`) — the Java agent that instruments Camel applications
+- Protocol defined in `cameleer3-common/PROTOCOL.md` in the agent repo
+- This server depends on `com.cameleer3:cameleer3-common` (shared models and graph API)
+
+## Modules
+
+- `cameleer3-server-core` — domain logic, storage, agent registry
+- `cameleer3-server-app` — Spring Boot web app, REST controllers, SSE, static resources
+
+## Build Commands
+
+```bash
+mvn clean compile          # Compile all modules
+mvn clean verify           # Full build with tests
+```
+
+## Run
+
+```bash
+java -jar cameleer3-server-app/target/cameleer3-server-app-1.0-SNAPSHOT.jar
+```
+
+## Key Conventions
+
+- Java 17+ required
+- Spring Boot 3.4.3 parent POM
+- Depends on `com.cameleer3:cameleer3-common` from Gitea Maven registry
+- Jackson `JavaTimeModule` for `Instant` deserialization
+- Communication: receives HTTP POST data from agents, serves SSE event streams for config push/commands
+- Maintains agent instance registry with states: LIVE → STALE → DEAD
+- Storage: ClickHouse for structured data, text index for full-text search
+- Security: JWT auth, Ed25519 config signing, bootstrap token for registration