docs: update route and doc for security reports/reporting

.github/ISSUE_TEMPLATE/config.yml

@@ -6,6 +6,6 @@ contact_links:
   - name: Subsonic API Compatibility
     url: https://www.subsonic.org/pages/api.jsp
     about: Reference documentation for the Subsonic REST API that Airsonic-Pulse implements.
-  - name: Security Vulnerabilities (Critical)
+  - name: Security Vulnerabilities
     url: https://github.com/litebito/airsonic-pulse/security/advisories/new
-    about: Report critical or exploitable security vulnerabilities privately via GitHub Security Advisories — do not open a public issue.
+    about: All security vulnerabilities must be reported privately via GitHub Security Advisories. Do not open a public issue.

.github/ISSUE_TEMPLATE/security_vulnerability.yml

@@ -1,72 +0,0 @@
-name: Security Vulnerability
-description: Report a security vulnerability in Airsonic-Pulse
-title: "[Security]: "
-labels: ["security", "triage"]
-body:
-  - type: markdown
-    attributes:
-      value: |
-        ## Before submitting
-
-        **If this vulnerability is critical or could be exploited in the wild, please do not open a public issue.**
-        Report it privately via [GitHub Security Advisories](https://github.com/litebito/airsonic-pulse/security/advisories/new) instead.
-
-        Use this template only for lower-severity issues that are safe to disclose publicly.
-
-  - type: dropdown
-    id: severity
-    attributes:
-      label: Severity
-      description: Your assessment of the severity of this vulnerability.
-      options:
-        - "Low — informational, minimal impact"
-        - "Medium — limited impact, requires specific conditions"
-        - "High — significant impact, exploitable in common configurations"
-        - "Critical — please use GitHub Security Advisories instead"
-    validations:
-      required: true
-
-  - type: input
-    id: affected-versions
-    attributes:
-      label: Affected Versions
-      description: Which versions of Airsonic-Pulse are affected?
-      placeholder: "e.g. 11.0.0 – 12.0.0"
-    validations:
-      required: true
-
-  - type: textarea
-    id: description
-    attributes:
-      label: Vulnerability Description
-      description: Describe the vulnerability and what an attacker could achieve by exploiting it.
-    validations:
-      required: true
-
-  - type: textarea
-    id: reproduction
-    attributes:
-      label: Steps to Reproduce
-      description: Provide minimal steps to reproduce the vulnerability.
-      placeholder: |
-        1.
-        2.
-        3.
-    validations:
-      required: true
-
-  - type: textarea
-    id: impact
-    attributes:
-      label: Impact
-      description: What data, functionality, or users could be affected?
-    validations:
-      required: true
-
-  - type: textarea
-    id: mitigation
-    attributes:
-      label: Suggested Mitigation
-      description: If you have a suggested fix or workaround, describe it here.
-    validations:
-      required: false