sciagent code + Gitea Actions CI/CD

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

be0/migrations/026_imagehub_file_folder_path.sql

@@ -0,0 +1,21 @@
+-- ImageHub: persist the relative folder path of each uploaded file (Option B — real folders inside
+-- a dataset). Until now logical_path was basename-flattened, so an uploaded directory structure
+-- (e.g. the nnU-Net imagesTr/labelsTr layout) was lost once files reached MinIO. folder_path keeps
+-- the relative directory so the dataset browser can render a real folder tree and the structure
+-- round-trips. The working-file natural key moves from (dataset_id, logical_path) to
+-- (dataset_id, folder_path, logical_path) so two files sharing a basename in different folders no
+-- longer collide and silently merge. Existing rows default folder_path to the empty string, so the
+-- new key stays unique wherever the old one was. Idempotent.
+-- Apply after 025 (no semicolons inside comments or string literals — the runner splitter is naive):
+--   docker exec -i initiative-postgres psql -U initiative -d initiatives < be0/migrations/026_imagehub_file_folder_path.sql
+
+ALTER TABLE imagehub_dataset_files
+  ADD COLUMN IF NOT EXISTS folder_path TEXT NOT NULL DEFAULT '';
+
+DROP INDEX IF EXISTS uq_imagehub_dataset_files_path;
+
+CREATE UNIQUE INDEX IF NOT EXISTS uq_imagehub_dataset_files_folder_path
+  ON imagehub_dataset_files (dataset_id, folder_path, logical_path);
+
+CREATE INDEX IF NOT EXISTS idx_imagehub_dataset_files_folder
+  ON imagehub_dataset_files (dataset_id, folder_path);