Add requirements.txt for both backends

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -154,10 +154,10 @@ After restart, the SGA confirms: `Vector Memory Area: 536870912 bytes (512 MB)`.
 | `psycopg2-binary` | 2.9.11 | pgvector only | PostgreSQL driver |
 | `oracledb` | 3.4.2 | Oracle only | Oracle driver (thin mode, no client libs needed) |
 
-**Install all packages:**
+**Install packages:**
 ```bash
-pip3 install fastapi uvicorn psycopg2-binary oracledb sentence-transformers \
+pip3 install -r pgvector-demo/backend/requirements.txt --break-system-packages
-             Pillow python-dotenv --break-system-packages
+pip3 install -r oravector-demo/backend/requirements.txt --break-system-packages
 ```
 
 ---

oravector-demo/backend/requirements.txt

@@ -0,0 +1,7 @@
+fastapi==0.135.2
+uvicorn==0.42.0
+oracledb==3.4.2
+sentence-transformers==5.3.0
+torch==2.11.0
+Pillow==10.2.0
+python-dotenv==1.0.1

pgvector-demo/backend/requirements.txt

@@ -0,0 +1,7 @@
+fastapi==0.135.2
+uvicorn==0.42.0
+psycopg2-binary==2.9.11
+sentence-transformers==5.3.0
+torch==2.11.0
+Pillow==10.2.0
+python-dotenv==1.0.1