feat(inflection): add dns_1123() for Kubernetes DNS-1123 label normalization

[pyramation]

Summary

Adds inflection.dns_1123(text) — a single, readable SQL function that normalizes an arbitrary string into a Kubernetes DNS-1123 label. Downstream (constructive-db) derives Knative/K8s object names (<slug>-secrets, <slug>-config, service names) and currently hand-builds this exact regexp chain as inline SQL-AST nodes, producing an unreadable nested blob. Consolidating the logic into one named function lets callers emit a single inflection.dns_1123(slug) call.

None of the existing slugify/pg_slugify/dashed functions fit: they keep underscores (\w), have no 63-char label cap, and don't do the :→-- namespacing K8s labels need.

inflection.dns_1123(value) =
  lower(value)
    |> replace(':', '--')                    -- keep namespaced-identifier boundary
    |> replace('_', '-')
    |> regexp_replace('[^a-z0-9-]', '', 'g')  -- strip invalid chars
    |> regexp_replace('^-+|-+$', '', 'g')     -- trim leading/trailing hyphens
    |> left(63)                               -- DNS label limit
    |> regexp_replace('[^a-z0-9]+$', '')      -- drop trailing '-' left by truncation

Examples: my_service → my-service, org:api → org--api, Hello, World! → helloworld, 'a'×80 → 'a'×63.

STRICT IMMUTABLE. 10 case tests added. pgpm package also synced the bundle/control/Makefile to the already-current 0.30.0 (they lagged at 0.15.5).

Link to Devin session: https://app.devin.ai/sessions/f4e36ac1d5854101838e6825df191c99
Requested by: @pyramation

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