Initial upload with full project structure

app/confgen.yaml

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+templates:
+  simple:
+    path: examples/simple.yaml
+    format: yaml
+    schema: examples/schema.json
+
+  complex:
+    path: examples/complex.yaml
+    format: yaml
+
+environments:
+  dev:
+    variables:
+      APP_NAME: myapp-dev
+      VERSION: 1.0.0-dev
+      DEBUG: true
+      DB_HOST: localhost
+      DB_PORT: 5432
+      DB_NAME: myapp_dev
+      USE_CACHE: false
+      CACHE_TTL: 60
+      LOG_LEVEL: debug
+      LOG_FORMAT: "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+      API_HOST: localhost
+      API_PORT: 8080
+      API_TIMEOUT: 30
+      FEATURES:
+        - feature1
+        - feature2
+      SERVICES:
+        - name: web
+          host: localhost
+          port: 80
+        - name: api
+          host: localhost
+          port: 8080
+      USE_METRICS: false
+
+  staging:
+    variables:
+      APP_NAME: myapp-staging
+      VERSION: 1.0.0-staging
+      DEBUG: true
+      DB_HOST: staging-db.example.com
+      DB_PORT: 5432
+      DB_NAME: myapp_staging
+      USE_CACHE: true
+      CACHE_TTL: 300
+      LOG_LEVEL: info
+      LOG_FORMAT: "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+      API_HOST: api-staging.example.com
+      API_PORT: 8080
+      API_TIMEOUT: 30
+      FEATURES:
+        - feature1
+        - feature2
+        - feature3
+      SERVICES:
+        - name: web
+          host: web-staging.example.com
+          port: 80
+          replicas: 2
+        - name: api
+          host: api-staging.example.com
+          port: 8080
+          replicas: 2
+      USE_METRICS: true
+      METRICS_ENDPOINT: https://metrics-staging.example.com
+
+  prod:
+    variables:
+      APP_NAME: myapp
+      VERSION: 1.0.0
+      DEBUG: false
+      DB_HOST: db.example.com
+      DB_PORT: 5432
+      DB_NAME: myapp_prod
+      USE_CACHE: true
+      CACHE_TTL: 600
+      LOG_LEVEL: warning
+      LOG_FORMAT: "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+      API_HOST: api.example.com
+      API_PORT: 443
+      API_TIMEOUT: 60
+      FEATURES:
+        - feature1
+        - feature2
+        - feature3
+        - feature4
+      SERVICES:
+        - name: web
+          host: web.example.com
+          port: 80
+          replicas: 4
+        - name: api
+          host: api.example.com
+          port: 443
+          replicas: 4
+      USE_METRICS: true
+      METRICS_ENDPOINT: https://metrics.example.com