markdown-vault-mcp: point STATE_PATH at a file, not the PVC mount dir

Fixes IsADirectoryError on startup when the app tried to atomically
write its change-tracking state to /data/state itself.

clusters/base/apps/mosquitto/secret.enc.yaml

@@ -4,19 +4,19 @@ metadata:
     name: mosquitto-passwd
     namespace: mqtt
 stringData:
-    passwd: ENC[AES256_GCM,data:RCzIQ2VUxlwiCIs7J7XmUAJnjCilnZdIPHY8/9YlrJmEbeykffaAu4rZonyqkg706aGkuN5l2/oB2uQmGSRMWBBi3ZLp8S5a2lqs9RnTmmc0T6HskndjoUa7NLItCf5z+wzgvg8YsoS/U9vVeXW2elvk/0fbKcdjN+FzK08ABjXTVnZgbCLArgQAG3LzZvug4mgRencGJSsEXMAyObfCAmc1aEZ7no3pcaFHI9EugKbZhh5IP8oJ/0UeC8l2hA==,iv:KkzxdAgv3KnGw+kAt0f5tR5mYMONk77n4nBZdbADqog=,tag:w8/DVnZ4wHj7kSf1n8KrQw==,type:str]
+    passwd: ENC[AES256_GCM,data:e6ANWA6/a9RNrVMKgT3ihB8hczlV6rp7qSdxwpjMr9YKEe9qbt6IsKncr7chbNVST8XagDdXwSbaT0COGHFJ2n9r13cjnHDhP5ORsXOgeiUvS1IR6pENlfJNabe47OU34Y31ZE5vCp6iD8fdjWXLLoMU34BBfOX2Ze+Oaz5msSMK+ePse6ApViU1rLVgzl3wpAS35FYuRRigcaCYagfUtGyF90/ULlgeeUUXNDvJNXbVTRYnDZ4ufaZtjS0tLA==,iv:mLwp37drBDmwOxUDhyDexavg6wtUadxllFdM9qjXaQs=,tag:PIM8GzItfxx6firuuoN0IA==,type:str]
 sops:
     age:
         - recipient: age1u236u5mzkzj72y4mfxx68gfqw0u0j6tdgkudnm5pdfpe7apq4u6s89jr2h
           enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBXK21EUVhMRjVPdEFYWHVW
-            K2NXR2VnQUhjTkJYNXRpMC9YQ28zMmswSkZNCldZVnpId3grazBrSWxyOFBhMXpr
-            c2QvRmUyWHBuaHhUWTNEd1JRSTFVMDQKLS0tIElHaE5mVWJDVmx0d3BRWlhudXNu
-            c2FIRFQ3bHdUeGRaVkFud2ovL2l5Z1kK5Id0Cq+2G9qhWWl61gKgCDX9/TzZuDK9
-            qNiYZLbbRCCRRIFiou/YYGAeOZOahULRFzp7kpFU+eb2RQ3Lf/49CA==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBOUEI0U2p3dGpPTmJRbDFO
+            SEE3Z08ycG1JOVpUWTNKZnZvcW1DS3ZVQTJJClJnRlA0cmpnQVRrN3lZNUFLRlJ6
+            OVo5bU5lTHk2Qm9BcG94WEZLbE1Od0EKLS0tIE53d01FWEg1SmVhWDd3dEhya3I1
+            ZnVIanBra2t6dGJrMjJXTUJ3N3pXbDQKj2Qmr9YBOkFTLHPv1AVcXdGvnTThzvhR
+            P/xYpElx5F0+/uK3T5n9z9Ny0v1Lr3mDYFXRhsyuVXc6+jd2gDmoMQ==
             -----END AGE ENCRYPTED FILE-----
-    lastmodified: "2026-08-26T10:20:22Z"
-    mac: ENC[AES256_GCM,data:ryJEHqt4NWoauhSTIzmEuHGhWnmhHMdSl6+82PK+QET11yM3HeB+P4WNsjAjWfy2/n7AHrknwLDMYYEVr5BEG2iFvyiSuymgink24kY7JeCPUZ0yxZN9GpUeDzSLS/pKhWidaYMJpAc0Dmm107GNQ/rKll/oy7OYz5k27ufiLFs=,iv:0Wl1WY4TAV/DEkCBsCk+2qAqOjNLQwHH56QibrdeXX0=,tag:19juWUmzAwyiaUixJ+fL5Q==,type:str]
+    lastmodified: "2026-08-26T10:20:27Z"
+    mac: ENC[AES256_GCM,data:KifUT3wKB9SLrcsW7jGeJLPEnRvA/IR4FYu2jd1z9wanMK3J8Z5wpf+DkjvtUIDupAh+wjzLLMeHHBcMSFvps5/iMTKQ9lgfMwkkqFKnRnpUx1Au2L7LWFghZlYTSlJ91eK3SB+ffsvz53EzKD2ITHt/qDaQa80j0U25Ztj+sJ8=,iv:D19zt+hsNWYw6ttQw3j5dOwwK4QjfGCWKy8lL5/Ryc4=,tag:eQxDxn+TU2BSh377bMnv+g==,type:str]
     encrypted_regex: ^(data|stringData)$
     version: 3.11.0