fix(gotify): move SOPS secrets to ksops generator

ArgoCD couldn't decrypt secrets.yaml because it was listed as a plain
kustomize resource. Move the 3 secrets (gotify-admin, gotify-tokens,
gotify-smtp) to k8s/argocd/secrets/ as .enc.yaml files processed by
the ksops generator, matching the repo convention.

Fixes ComparisonError: 'Object Kind is missing' (SOPS ciphertext
parsed as raw YAML).

k8s/argocd/secrets/gotify-admin-secrets.enc.yaml

@@ -0,0 +1,24 @@
+apiVersion: ENC[AES256_GCM,data:wR4=,iv:cRBzbvu0eUYCYeKeysua1/P3Meli/rQyj/mIV6VWnPM=,tag:oyTPA/mLYNUX+QDkYLlZyQ==,type:str]
+kind: ENC[AES256_GCM,data:bdKQdadW,iv:F3DQiBI9xhSx87jkS1Hyevo48uUCBjsJSjbScIBznKA=,tag:PFakzzBj5S9F65dxu0L2rg==,type:str]
+metadata:
+    name: ENC[AES256_GCM,data:XHFYrKClPo+IwRbM,iv:ZGuL+cN840Y1bOTC62NhDDcoZpTzDWQ4GfqPJX/QWmI=,tag:hlCVjzvfcxXGOASc3vda/Q==,type:str]
+    namespace: ENC[AES256_GCM,data:0BbhgZBog+1qY/iRJA==,iv:88tiSpEDqIokT5VP/d6bB2+aUyh1kZ7NEHwZWoJW3XU=,tag:CBR01jh2U9h7kNEcK1e1sA==,type:str]
+type: ENC[AES256_GCM,data:Mpv1V73w,iv:BW3r6RpLnwe3XDKwrZySyOjrWUnSwIG5JOoPLzP/5gM=,tag:oyJySL0haOei1m4i+1AJ1g==,type:str]
+stringData:
+    username: ENC[AES256_GCM,data:8xmxLGE=,iv:J/vEvXGoD+ka6FDgnSwDz0fs9IxuJIZW9r7Oyu2qxC8=,tag:dN9jd6NSavMN8+uzvemYWg==,type:str]
+    password: ENC[AES256_GCM,data:vB9PaaUiQZ8FY8pO0cq1fHLi7Gq5t4U=,iv:C0Y1m2SGYP3oTIFoau5JavVmLblj6te/SPMLodIwiZw=,tag:3Ip4YvR4WPzR0bBpTyjytA==,type:str]
+sops:
+    age:
+        - enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBRT3JoTnhVVW5SUUJXbTdz
+            dUpLcmtBWWhyaGk3Y1hBM1ArcVI5eHREbmp3CiswUGVmd0NhejZwQ2UvNEdxS3ow
+            L1RweS9Kb2paeStLZ0tLSFdWbVZqQW8KLS0tIHJHT3hiMmxtM0Q1Ym5KOVpLVFpl
+            enR3NmdNdmdwVitTQVJlRHFWcjR0N2sKQw9ZZs+Ji/Zq/feO3qy4DwaCfWgDOQ/z
+            FVVhcCXweN58tb+9fzCJ+pNi/hSmvUkCMbb1+60qBvEehNzOoMRJ5g==
+            -----END AGE ENCRYPTED FILE-----
+          recipient: age1e5fq3hwxy78psus2nfvmtmua36g0u3suk78ephw6246l974d2utsvn0hla
+    lastmodified: "2026-09-10T13:31:00Z"
+    mac: ENC[AES256_GCM,data:3HWV/NG0yTbsxY28u41zTRmAPc1kokGb4nCLmAsyq8/uvxcP+evDNyZXYpS93eVdPRfRZ1OqVBzyVGJEnj7JSXQVmlzor9JcWEL2fcpogoLVfJZKTRD6hk6optnBMjj84iQEEOx3A80JrDOdoXsH0pd9bJBABwoUOJwuufbXcIU=,iv:KLZsmAcapQgV08pFhGIvPt5ylsWg3xazAAjPuJYOaXA=,tag:1vKA3fISMIurHzxZ04F3lg==,type:str]
+    unencrypted_suffix: _unencrypted
+    version: 3.13.2