Surface assignment vocabulary on CLI flags and Web UI routes

[scott-rc]

Phase 3 of the assignment-redesign plan. Stacked on #139.

Operators with shipped manifests passing --function-* flags or SKIPPER_FUNCTION_* env vars need binaries to keep parsing those names through the deprecation window, and tenants visiting /functions/... URLs in the dashboard need to land somewhere coherent. This phase adds the canonical assignment-named surfaces alongside the legacy ones; the cleanup followup plan removes the legacy half after a deploy plus deprecation window.

CLI flags and env vars

The config binder's flag struct tag now accepts comma-separated names: first is canonical, rest are deprecated aliases. Aliases register as hidden flags, derive their own SKIPPER_* env-var fallbacks, and emit a one-shot deprecation log on first use of either form.

Controller fields rename to AssignmentNamespaces, AssignPath, AssignTimeout with --assignment-namespaces, --assign-path, --assign-timeout as canonical and the legacy --function-namespaces, --function-assign-path, --function-assign-timeout as aliases.

Dev tooling (cmd/dev/up.go, cmd/dev/deploy.go, cmd/dev/kube_lint.go, internal/dev/krane/krane_test.go) and the krane goldens migrate to SKIPPER_ASSIGNMENT_NAMESPACES and assignment_namespaces as the canonical names. template.yaml.erb accepts either assignment_namespaces or function_namespaces as input but always emits SKIPPER_ASSIGNMENT_NAMESPACES.

Web UI

/assignments, /assignments/{key}, /sse/assignments, and /sse/assignment/{key} are the canonical routes; the legacy /functions/* and /sse/function* paths return 301 to their assignment counterparts (preserving query strings). Datastar's EventSource follows the 30x on the initial handshake.

Templates function.html and functions.html rename to assignment.html / assignments.html. The assignmentsData Go struct's signal fields rename to AssignmentSearch/AssignmentSort/AssignmentSortDir (JSON tags assignmentSearch etc.), the events page's signal renames eventFunction to eventAssignment, and tenantRow.Functions / controllerRow.Functions / routerRow.Functions rename to Assignments. Templates surface "Assignments" instead of "Functions" in nav links, page titles, stat-card labels, and column headers.

activeNav highlights /assignments for both function- and assignment-prefixed page titles. The /events page accepts ?assignment= and falls back to ?function= (new wins on conflict).

Tests

• New TestFlagAliases cases cover the canonical/alias flag form, env-var fallback for the alias, hidden flag bit, and description content.
• New controller_test.go case covers the --function-namespaces legacy alias still flowing into AssignmentNamespaces.
• New TestLegacyRoutesRedirect (and TestSSELegacyRoutesRedirect) cover the 301 from /functions/* and /sse/functions/*.
• Events filter tests gain ?assignment=, legacy ?function=, and the new-wins-on-conflict cases.
• Goldens regenerated: internal/cmd/testdata/help_controller.golden, all 10 internal/dev/krane/testdata/*.golden.yaml files.

Test plan

• dev test passes
• dev lint clean
• dev kube-lint clean
• Manual: --function-namespaces=... parses and emits a deprecation log
• Manual: GET /functions returns 301 to /assignments; GET /sse/functions returns 301 to /sse/assignments

[scott-rc]

This change is part of the following stack:

• Rename Function to Assignment and dual-write K8s annotations #138
  • Dual-emit assignment vocabulary on header, metrics, and telemetry #139
    • Surface assignment vocabulary on CLI flags and Web UI routes #140 ◀

_{Change managed by git-spice.}

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