feat(9681): add Taxonomy Publishing CDA support with localization

[OMpawar-21]

Summary

• Adds Taxonomy Publishing access via the CDA: list all taxonomies, fetch a taxonomy, list/fetch terms, and walk term hierarchy (locales, ancestors, descendants).
• Taxonomies(uid) scopes to a specific taxonomy; the existing Taxonomies() (entry-filtering) is untouched.
• All calls support locale filtering and locale fallback, verified across multi-level term hierarchies (parent → child → grandchild).
• Centralizes request-building, header-merging, and error-parsing for the new Taxonomy/Term/TermQuery classes into a single internal helper — no duplicated logic across the three.

API surface

stack.Taxonomies().Find<T>()                                  // list all taxonomies
stack.Taxonomies(uid).Fetch<T>()                               // fetch one taxonomy
stack.Taxonomies(uid).Terms().Find<T>()                        // list terms
stack.Taxonomies(uid).Term(termUid).Fetch<T>()                 // fetch one term
stack.Taxonomies(uid).Term(termUid).Locales<T>()               // term's locales
stack.Taxonomies(uid).Term(termUid).Ancestors<T>()             // term's ancestors
stack.Taxonomies(uid).Term(termUid).Descendants<T>()           // term's descendants

// modifiers: SetLocale, IncludeFallback, Depth, IncludeBranch, Skip, Limit, IncludeCount, AddParam

Test plan

• Unit tests (mocked, no network) covering every modifier, factory guard, and constructor validation
• Live integration tests against a real stack covering all endpoints, locale/fallback, and depth-limited hierarchy traversal (parent/child/grandchild)
• Full existing unit suite passes with no regressions

🤖 Generated with Claude Code

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed