Add decoupled configYAML path to MCPRegistry CRD

[ChrisJBurns]

Summary

The MCPRegistry CRD currently mirrors the registry server's config.yaml structure field-by-field, coupling the operator to registry server config changes. PR #4653 demonstrated this cost: 2,993+/2,458- lines to align the CRD with a v2 config format. Every time the registry server's config evolves, the operator must update its CRD types, config generation logic, and tests — often as a breaking CRD change.

This adds a new decoupled config path alongside the existing typed fields, allowing gradual migration:

• configYAML: raw YAML string passed through to the registry server as config.yaml — the operator does not parse, validate, or transform it
• volumes / volumeMounts: standard corev1.Volume and corev1.VolumeMount types for user-managed volume wiring (secrets, ConfigMaps, PVCs)
• pgpassSecretRef: operator-managed pgpass mount with init container for chmod 0600 — the one piece of Kubernetes plumbing users cannot express through volumes alone (PostgreSQL's libpq rejects pgpass files that aren't mode 0600, and Kubernetes secret volumes mount as root-owned)

The two paths are mutually exclusive (CEL admission rules + reconciler defense-in-depth validation). The existing typed fields (sources, registries, databaseConfig, authConfig) are deprecated but fully functional. A future release will remove the legacy path after users have migrated.

Resolves: #4702

Type of change

• New feature

Test plan

• Unit tests (task test) — 27 new tests covering RawConfigToConfigMap, WithPGPassSecretRefMount, and validateNewPathSpec (mutual exclusivity, reserved names, mount path collisions)
• Linting (task lint-fix) — no new lint issues (pre-existing deprecation warnings expected)
• Build verification (go build ./cmd/thv-operator/...)

Changes

File	Change
mcpregistry_types.go	Add ConfigYAML, Volumes, VolumeMounts, PGPassSecretRef fields; deprecate Sources, Registries, DatabaseConfig, AuthConfig; add CEL mutual exclusivity rules
zz_generated.deepcopy.go	Regenerated for new fields
mcpregistry_controller.go	Add validateNewPathSpec with 4 focused sub-functions (path exclusivity, reserved names, mount path collisions); call before reconciliation
mcpregistry_controller_test.go	15 new validation test cases + fixture updates for relaxed Sources requirement
config/raw_config.go	New RawConfigToConfigMap() — creates ConfigMap from raw YAML with content checksum
config/raw_config_test.go	4 test cases
deployment.go	New buildRegistryAPIDeploymentNewPath + ensureDeploymentNewPath — new path deployment builder with user volume/mount injection
manager.go	New reconcileNewPath; refactor ReconcileAPIService to branch new/legacy path
podtemplatespec.go	New WithPGPassSecretRefMount — takes user SecretKeySelector instead of generated secret name
podtemplatespec_test.go	8 test cases for WithPGPassSecretRefMount
types.go	Export 5 constants for cross-package validation access
CRD manifests	Regenerated
6 example YAMLs	New configYAML examples: minimal, ConfigMap, git auth, API, pgpass, OAuth
RFC document	docs/proposals/001-mcpregistry-config-decoupling.md

Does this introduce a user-facing change?

Yes. Users can now choose between two config paths:

New path (recommended for new deployments):

spec:
  configYAML: |
    sources:
      - name: k8s
        format: upstream
        kubernetes: {}
    registries:
      - name: default
        sources: ["k8s"]
    database:
      host: postgres
      port: 5432
      user: db_app
      database: registry
    auth:
      mode: anonymous

Legacy path (existing, deprecated): unchanged, fully functional.

Special notes for reviewers

• No legacy breakage: all existing types, functions, tests, and examples are untouched. The legacy path is exercised by the same tests as before.
• RFC included: docs/proposals/001-mcpregistry-config-decoupling.md documents the full design, all migration scenarios, PodTemplateSpec merge conflict analysis, pgpass rationale, and a Phase 2 deprecation removal plan.
• PR size: the diff is large but ~5,300 lines are regenerated CRD manifests. Core logic is ~1,100 lines of new code.
• pgpassSecretRef rationale: exists because PostgreSQL's libpq rejects pgpass files without 0600 permissions, Kubernetes mounts secrets as root-owned, and the container runs as non-root (UID 65532). The init container pattern cannot be expressed through volumes/volumeMounts alone. See the RFC's PGPass Discussion section.

Large PR Justification

• is a bit tricky to do all these changes in separate PRs
• we're also pressed for time

Generated with Claude Code

[github-actions]

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## Large PR Justification

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[codecov]

Codecov Report

❌ Patch coverage is 54.13793% with 133 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.61%. Comparing base (3c5da31) to head (691e8b3).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/thv-operator/pkg/registryapi/deployment.go	9.72%	64 Missing and 1 partial ⚠️
cmd/thv-operator/pkg/registryapi/manager.go	6.25%	44 Missing and 1 partial ⚠️
...thv-operator/controllers/mcpregistry_controller.go	82.41%	12 Missing and 4 partials ⚠️
cmd/thv-operator/pkg/registryapi/service.go	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4693      +/-   ##
==========================================
- Coverage   68.66%   68.61%   -0.06%     
==========================================
  Files         509      516       +7     
  Lines       52987    53841     +854     
==========================================
+ Hits        36384    36942     +558     
- Misses      13782    14051     +269     
- Partials     2821     2848      +27     

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[github-actions]

✅ Large PR justification has been provided. The size review has been dismissed and this PR can now proceed with normal review.