Route-map color community template

[ben-malbeclabs]

Add set extcommunity color to RM-USER-*-IN route-map template. Resolve include_topologies per tenant; fall back to color 1 (UNICAST-DEFAULT) if empty. Multi-color: render all values in a single set extcommunity color statement.

Milestone: RFC-18: Controller — Community Stamping
RFC: #3288

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Files affected:

• controlplane/controller/internal/controller/ (route-map template)

Size: Medium

Tests:

• Empty include_topologies stamps color 1
• Two-topology tenant stamps both color values in single statement
• Multicast tunnel excluded from stamping
• No stamping when enabled: false

Blockers: #3351 (IS-IS TE templates), #3346 (include_topologies on Tenant)