fix(docker): revert healthcheck to wget for Alpine compatibility (#986)

## Problem
PR #906 changed healthcheck commands from `wget` to `curl`, but Alpine Linux
(our base image) does not include `curl` by default, causing all containers
to fail healthchecks with:
```
exec: "curl": executable file not found in $PATH
```
This creates a configuration mismatch:
- docker/Dockerfile.backend uses `wget` (✅ works)
- docker-compose.yml uses `curl` (❌ fails)
## Root Cause Analysis
Alpine Linux philosophy is minimalism:
- ✅ `wget` is pre-installed (part of busybox)
- ❌ `curl` requires `apk add curl` (~3MB extra)
The original PR #906 made two commits:
1. First commit (3af8760): `curl` → `wget` (✅ correct fix)
2. Second commit (333b2ef): `wget` → `curl` (❌ introduced bug)
The second commit was based on incorrect assumption that "curl is more
widely available than wget in Docker images". This is false for Alpine.
## Solution
Revert healthcheck commands back to `wget` to match:
1. Alpine's pre-installed tools
2. Dockerfile.backend healthcheck (line 68)
3. Docker and Kubernetes best practices
## Testing
✅ Verified `wget` exists in Alpine containers:
```bash
docker run --rm alpine:latest which wget
# Output: /usr/bin/wget
```
✅ Added new CI workflow to prevent regression:
- `.github/workflows/pr-docker-compose-healthcheck.yml`
- Validates healthcheck compatibility with Alpine
- Ensures containers reach healthy status
## Impact
- **Before**: Containers show (unhealthy), potential auto-restart loops
- **After**: Containers show (healthy), monitoring systems happy
- **Scope**: Only affects docker-compose deployments
- **Breaking**: None - this is a bug fix
## References
- PR #906: Original (incorrect) fix
- Alpine Linux: https://alpinelinux.org/about/
- Dockerfile.backend L68: Existing `wget` healthcheck
Co-authored-by: the-dev-z <the-dev-z@users.noreply.github.com>
Co-authored-by: tinkle-community <tinklefund@gmail.com>
Co-authored-by: Shui <88711385+hzb1115@users.noreply.github.com>

docker-compose.yml

@@ -25,7 +25,7 @@ services:
     networks:
       - nofx-network
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:8080/api/health"]
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:8080/api/health"]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -45,7 +45,7 @@ services:
     depends_on:
       - nofx
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://127.0.0.1/health"]
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://127.0.0.1/health"]
       interval: 30s
       timeout: 10s
       retries: 3