fix: handle NULL status values in migration 008

Fixes production deployment crash where migration 008 fails with:
"column status of relation servers contains null values"

Problem:
- Migration was extracting status from wrong location
- Old format has status at TOP LEVEL of JSON, not in official metadata
- 9 servers have explicit "status": null in their JSON
- Migration incorrectly tried to extract from official_meta->>'status' (always NULL)
- This would cause ALL servers to have NULL status, failing NOT NULL constraint

Solution:
- Extract status from TOP LEVEL JSON (rec.value->>'status') for all records
- Use NULLIF to convert string 'null' to SQL NULL, then COALESCE to 'active'
- Ensures all status values are non-NULL before constraint is added

Affected servers with null status:
- com.biodnd/agent-ip
- io.github.jkakar/cookwith-mcp
- com.joelverhagen.mcp/Knapcode.SampleMcpServer
- io.github.Lyellr88/marm-mcp-server
- com.biodnd/agent-press
- io.github.timheuer/sampledotnetmcpserver
- io.github.CodeCraftersLLC/local-voice-mcp
- com.biodnd/agent-fin
- io.github.ruvnet/ruv-swarm

Author: tadasant

internal/database/migrations/008_separate_official_metadata.sql

@@ -35,9 +35,10 @@ BEGIN
 
         IF official_meta IS NOT NULL THEN
             -- Update columns with extracted metadata
+            -- Note: status is at top level in old format, not in official_meta
             UPDATE servers
             SET
-                status = (official_meta->>'status')::VARCHAR(50),
+                status = COALESCE(NULLIF(rec.value->>'status', 'null'), 'active'),
                 published_at = (official_meta->>'publishedAt')::TIMESTAMP WITH TIME ZONE,
                 updated_at = (official_meta->>'updatedAt')::TIMESTAMP WITH TIME ZONE,
                 is_latest = (official_meta->>'isLatest')::BOOLEAN
@@ -46,7 +47,7 @@ BEGIN
             -- Handle records without official metadata (set defaults)
             UPDATE servers
             SET
-                status = COALESCE((rec.value->>'status'), 'active'),
+                status = COALESCE(NULLIF(rec.value->>'status', 'null'), 'active'),
                 published_at = NOW(),
                 updated_at = NOW(),
                 is_latest = true