feat(digger): containerize BtToxin_Digger with v5 database integration

- Added Dockerfile and docker-compose.yml for BtToxin_Digger
- Integrated external v5 BLAST database into the container image
- Updated main docker-compose.yml to include the digger service
- Updated documentation with database update instructions

bttoxin_digger_v5_repro/external_dbs/bt_toxin/db/bt_toxin.pjs

@@ -0,0 +1,22 @@
+{
+  "version": "1.2",
+  "dbname": "bt_toxin",
+  "dbtype": "Protein",
+  "db-version": 5,
+  "description": "bt_toxin20251104.fas",
+  "number-of-letters": 996368,
+  "number-of-sequences": 1199,
+  "last-updated": "2025-11-04T15:35:00",
+  "number-of-volumes": 1,
+  "bytes-total": 1149077,
+  "bytes-to-cache": 1007264,
+  "files": [
+    "bt_toxin.pdb",
+    "bt_toxin.phr",
+    "bt_toxin.pin",
+    "bt_toxin.pot",
+    "bt_toxin.psq",
+    "bt_toxin.ptf",
+    "bt_toxin.pto"
+  ]
+}