[CREDO23]

Summary

• The catalog, connections and selection pages now say at the top that the model catalog proposal replaces them, and describe today's code until it ships.
• The proposal gains "What this replaces": each affected architecture page and its fate, and the four catalog Known gaps it closes.
• A TODO in write_presets names why the startup warm-up is lost: every rewrite restarts the router mid-load.

Follows #1899.

🤖 Generated with Claude Code

High-level PR Summary

This PR adds documentation clarifications marking which architecture pages are being redesigned by the model catalog proposal. It updates four architecture documentation files (connections.md, catalog.md, and selection.md) to note they describe current code until the redesign ships, adds a comprehensive "What this replaces" section to the proposal explaining the migration path and known gaps being fixed, and documents a TODO about startup warm-up performance loss caused by configuration file rewrites.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	docs/proposals/model-catalog.md
2	docs/architecture/connections.md
3	docs/architecture/local-models/catalog.md
4	docs/architecture/local-models/selection.md
5	surfsense_local/backend/modules/llm/providers/llamacpp/preset.py

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