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Goal: Provide a complete view of the ROS 2 system and enable basic data operations.

Developers can discover all running nodes, explore the entity hierarchy, and read/write
diagnostic data. This milestone establishes the foundation for all subsequent features.

Standard API coverage:

Discovery (11 endpoints) — version info, entity collections, hierarchy navigation
Data (5 endpoints) — data categories, groups, read/write operations

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MS1: Full Discovery & Data Access

Implement POST /components/{component_id}/services/{service_name} endpoint to enable calling ROS 2 services on components

Implement GET /areas/{area_id}/data endpoint to read aggregated data from all components within a specific area

Implement struct-based JSON serialization with visitor pattern

Discovery: Implement merge pipeline for discovery hybrid approach

Consolidate discovery handlers into a single unified DiscoveryHandlers

[BUG] Duplicate component created for root namespace nodes due to topic-based discovery collision