feat(cli): add --project filter to issue list

[nocoo]

Summary

Add --project flag to multica issue list so users can filter issues by project.

--project was added to issue create and issue update in #562, but issue list was missed. This makes the CLI inconsistent — you can assign issues to projects but cannot list them by project.

Changes

CLI (server/cmd/multica/cmd_issue.go)

• Register --project flag on issueListCmd
• Pass project_id query parameter in runIssueList

API handler (server/internal/handler/issue.go)

• Parse project_id query parameter in ListIssues
• Pass to ListIssuesParams, ListOpenIssuesParams, and CountIssuesParams

SQL (server/pkg/db/queries/issue.sql)

• Add project_id filter to ListIssues, ListOpenIssues, and CountIssues queries using the same sqlc.narg pattern as existing filters

Usage

multica issue list --project <project-id>
multica issue list --project <project-id> --status todo --output json

Test plan

• go build ./cmd/multica/ — compiles
• go build ./cmd/server/ — compiles
• go test ./cmd/multica/ — passes
• Manual test: created a project, assigned an issue, confirmed --project returns only matching issues

[vercel]

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
multica-web	Ignored		Apr 11, 2026 2:55am
multica-web-production	Ignored		Apr 11, 2026 2:55am