Remove public internet features and fix upstream source UI (#107)

- Remove is_public field from upstream sources (all sources are internal)
- Remove allow_public_internet setting from cache settings
- Remove seeding of public registry URLs
- Fix connectivity test to not follow redirects (fixes Artifactory error)
- Add dedicated Test column with OK/Error status badges
- Auto-test sources after save
- Add error modal for viewing full error details
- Fix table layout (no-wrap on source name)
- Add ORCHARD_PURGE_SEED_DATA to stage helm values

CHANGELOG.md

@@ -6,7 +6,22 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Upstream source connectivity test no longer follows redirects, fixing "Exceeded maximum allowed redirects" error with Artifactory proxies (#107)
+- Upstream sources table now has dedicated "Test" column with OK/Error status badges (#107)
+- Test runs automatically after saving a new or updated upstream source (#107)
+- Error states in upstream sources table are now clickable to show full error details in a modal (#107)
+- Source name column no longer wraps text for better table layout (#107)
+
+### Removed
+- Removed `is_public` field from upstream sources - all sources are now treated as internal/private (#107)
+- Removed `allow_public_internet` (air-gap mode) setting from cache settings - not needed for enterprise proxy use case (#107)
+- Removed seeding of public registry URLs (npm-public, pypi-public, maven-central, docker-hub) (#107)
+- Removed "Public" badge and checkbox from upstream sources UI (#107)
+- Removed "Allow Public Internet" toggle from cache settings UI (#107)
+
 ### Added
+- Added `ORCHARD_PURGE_SEED_DATA` environment variable support to stage helm values to remove seed data from long-running deployments (#107)
 - Added frontend system projects visual distinction (#105)
   - "Cache" badge for system projects in project list
   - "System Cache" badge on project detail page