feat: Docker network management with resource attachment

[aladdinb1]

Summary

• Adds Docker network management UI (Networks page) with create/edit/delete based on upstream Feat/add network management Dokploy/dokploy#3774, plus the four Greptile-flagged fixes from the original PR
• Resource-level attachment: applications and 6 database types (libsql, mariadb, mongo, mysql, postgres, redis) can attach to custom networks via the Advanced tab. Compose intentionally omitted (compose attaches via its YAML, not Swarm spec)
• Server-scoped networks: networks created on a custom server are routed to that Docker daemon over SSH; the resource picker filters to networks on the same server
• 15 schema + service tests borrowed from PR feat!: Network Management System v1 Dokploy/dokploy#2811 patterns

Test plan

• Unit tests pass (__test__/network/* — 15 cases)
• E2E on local Dokploy host: create network, attach to app, deploy, verify swarm service joined network
• E2E on remote Hetzner CX23 server: remote-test-net appears only on remote daemon, my-custom-net only on local — confirms server-scoped routing
• Resource picker correctly filters networks when app moved between servers (verified live)

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