fix(kt-db): merge alembic heads after multi-graph PR

[charlie83Gs]

Summary

• Merges three graph-db Alembic migration heads into a single head after PR feat: multi-graph support with schema isolation and RBAC #156 (multi-graph) and PR feat: add Docker quickstart guide and fix first-user admin promotion #71 (quickstart) both added migrations branching from different points

Heads merged

Head	Source
zzaj	Multi-graph: graph_slugs on api_tokens
fcd2d573ed5e	Existing merge point
c31dff170411	Quickstart: research_reports changes

Write-db already has a single head (w035), no merge needed.

Test plan

• alembic upgrade head succeeds from scratch on both graph-db and write-db
• Default graph row seeded correctly
• All tables present (graphs, graph_members, database_connections, api_tokens.graph_slugs)
• CI passes

🤖 Generated with Claude Code

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