Harden docker-compose security per KICS findings

- Bind all ports to 127.0.0.1 (local dev only)
- Add cap_drop: ALL to drop unnecessary Linux capabilities

Remaining KICS findings are acceptable for local dev:
- Shared volumes: Expected for database persistence
- Passwords in env: Local dev only, not real secrets
- minio-init healthcheck: Init container exits after setup

docker-compose.local.yml

@@ -6,7 +6,7 @@ services:
       context: .
       dockerfile: Dockerfile.local
     ports:
-      - "8080:8080"
+      - "127.0.0.1:8080:8080"
     environment:
       - ORCHARD_SERVER_HOST=0.0.0.0
       - ORCHARD_SERVER_PORT=8080
@@ -44,6 +44,8 @@ services:
       retries: 3
     security_opt:
       - no-new-privileges:true
+    cap_drop:
+      - ALL
     mem_limit: 1g
     cpus: 1.0
 
@@ -57,7 +59,7 @@ services:
       - postgres-data-local:/var/lib/postgresql/data
       - ./migrations:/docker-entrypoint-initdb.d:ro
     ports:
-      - "5432:5432"
+      - "127.0.0.1:5432:5432"
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U orchard -d orchard"]
       interval: 10s
@@ -68,6 +70,8 @@ services:
     restart: unless-stopped
     security_opt:
       - no-new-privileges:true
+    cap_drop:
+      - ALL
     mem_limit: 512m
     cpus: 0.5
 
@@ -80,8 +84,8 @@ services:
     volumes:
       - minio-data-local:/data
     ports:
-      - "9000:9000"
-      - "9001:9001"
+      - "127.0.0.1:9000:9000"
+      - "127.0.0.1:9001:9001"
     healthcheck:
       test: ["CMD", "mc", "ready", "local"]
       interval: 10s
@@ -92,6 +96,8 @@ services:
     restart: unless-stopped
     security_opt:
       - no-new-privileges:true
+    cap_drop:
+      - ALL
     mem_limit: 512m
     cpus: 0.5
 
@@ -111,6 +117,8 @@ services:
       - orchard-network
     security_opt:
       - no-new-privileges:true
+    cap_drop:
+      - ALL
     mem_limit: 128m
     cpus: 0.25
 
@@ -120,7 +128,7 @@ services:
     volumes:
       - redis-data-local:/data
     ports:
-      - "6379:6379"
+      - "127.0.0.1:6379:6379"
     healthcheck:
       test: ["CMD", "redis-cli", "ping"]
       interval: 10s
@@ -131,6 +139,8 @@ services:
     restart: unless-stopped
     security_opt:
       - no-new-privileges:true
+    cap_drop:
+      - ALL
     mem_limit: 256m
     cpus: 0.25