Add per-user agent runtime binding

[YOMXXX]

Summary

• add per-user agent runtime binding table and API endpoints
• resolve queued tasks to a member-specific runtime when a binding exists
• expose My runtime controls on the agent detail page

Tests

• cd server && go run github.com/sqlc-dev/sqlc/cmd/sqlc@v1.30.0 generate
• cd server && go test ./internal/handler -run TestAgentRuntimeBinding_EndToEnd -count=1
• cd server && go test ./internal/service ./cmd/server -count=1
• pnpm --filter @multica/core typecheck
• pnpm --filter @multica/views typecheck
• jq empty packages/views/locales/en/agents.json packages/views/locales/zh-Hans/agents.json
• git diff --check

[vercel]

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