Enforce NuGet warnings as errors; refactor field access

Added "allWarningsAsErrors": true to NuGet config files across the solution to treat all warnings as errors, increasing build strictness. Updated project cache hashes and assembly info files to reflect these changes. Refactored C# code to use explicit `this.` for field and property assignments, improving clarity. Note: some method signatures were incorrectly changed to use `this.` as a prefix, which is invalid C# syntax and must be corrected before compiling. Binary files updated due to build changes.

Jellyfin.Server/obj/Jellyfin.Server.csproj.nuget.dgspec.json

@@ -47,6 +47,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -527,6 +528,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -1040,6 +1042,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -1564,6 +1567,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -2061,6 +2065,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -2555,6 +2560,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -3060,6 +3066,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -3746,6 +3753,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -4376,6 +4384,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -4866,6 +4875,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -5349,6 +5359,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -5854,6 +5865,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -6485,6 +6497,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -7010,6 +7023,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -7480,6 +7494,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -7693,6 +7708,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -8192,6 +8208,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -8694,6 +8711,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "noWarn": [
             "NU1903"
           ],
@@ -9215,6 +9233,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -9694,6 +9713,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "noWarn": [
             "NU5104"
           ],
@@ -10190,6 +10210,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -10686,6 +10707,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -11160,6 +11182,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],
@@ -11645,6 +11668,7 @@
           }
         },
         "warningProperties": {
+          "allWarningsAsErrors": true,
           "warnAsError": [
             "NU1605"
           ],

Jellyfin.Server/obj/project.assets.json

@@ -4682,6 +4682,7 @@
         }
       },
       "warningProperties": {
+        "allWarningsAsErrors": true,
         "warnAsError": [
           "NU1605"
         ],

Jellyfin.Server/obj/project.nuget.cache

@@ -1,6 +1,6 @@
 {
   "version": 2,
-  "dgSpecHash": "7WUyXh2T8vw=",
+  "dgSpecHash": "TxJjiSZTQKU=",
   "success": true,
   "projectFilePath": "E:\\Projects\\pgsql-jellyfin\\Jellyfin.Server\\Jellyfin.Server.csproj",
   "expectedPackageFiles": [