refactor: retire external vector deployment

deploy/workspaces/preprocess-dwh.yaml

@@ -2,6 +2,10 @@ language: en
 dwh:
   type: postgres_direct
   connection:
-    {host: vector-db, database: thoth, schema: vectors, user: thoth_vector_reader,
-     password_file: "${THT_VECTOR_READER_PASSWORD_FILE}"}
+    host: "${THT_PREPROCESS_DWH_HOST:-dwh}"
+    port: "${THT_PREPROCESS_DWH_PORT:-5432}"
+    database: "${THT_PREPROCESS_DWH_DATABASE:-warehouse}"
+    schema: "${THT_PREPROCESS_DWH_SCHEMA:-public}"
+    user: "${THT_PREPROCESS_DWH_USER:-thoth_reader}"
+    password_file: "${THT_PREPROCESS_DWH_PASSWORD_FILE:-/run/secrets/preprocess-dwh-password}"
 roots: {artifacts: artifacts, indexes: indexes, sessions: sessions}

deploy/workspaces/preprocess-evidence.yaml

@@ -1,15 +1,22 @@
 language: en
 dwh:
   type: postgres_direct
-  connection: {host: unused, database: unused, schema: public, user: unused, password: unused}
+  connection:
+    host: "${THT_PREPROCESS_DWH_HOST:-unused}"
+    port: "${THT_PREPROCESS_DWH_PORT:-5432}"
+    database: "${THT_PREPROCESS_DWH_DATABASE:-unused}"
+    schema: "${THT_PREPROCESS_DWH_SCHEMA:-public}"
+    user: "${THT_PREPROCESS_DWH_USER:-unused}"
+    password_file: "${THT_PREPROCESS_DWH_PASSWORD_FILE:-/run/secrets/preprocess-dwh-password}"
 vectors:
-  type: pgvector_direct
-  reader:
-    {host: vector-db, database: thoth, schema: vectors, user: thoth_vector_reader,
-     password_file: "${THT_VECTOR_READER_PASSWORD_FILE}"}
-  writer:
-    {host: vector-db, database: thoth, schema: vectors, user: thoth_vector_writer,
-     password_file: "${THT_VECTOR_WRITER_PASSWORD_FILE}"}
+  type: qdrant
+  base_url: http://qdrant:6333
+  collection: preprocess-evidence
 roots: {artifacts: artifacts, indexes: indexes, sessions: sessions}
 evidence: {source_root: /data/source, evidence_dir: evidence}
-embeddings: {base_url: "${THT_OLLAMA_URL}", model: smoke, dim: 768, batch_size: 32}
+embeddings:
+  provider: ollama_internal
+  base_url: http://embedding:11434
+  model: qwen3-embedding:0.6b
+  dim: 1024
+  batch_size: 32