chore: Refactor CI workflows for pipeline consolidation and manual dispatch triggers

- Updated quality-checks.yml to support manual dispatch with frontend checks.
- Modified rate-limit-integration.yml to remove workflow_run triggers and adjust conditions for execution.
- Removed pull request triggers from repo-health.yml, retaining only scheduled and manual dispatch.
- Adjusted security-pr.yml and supply-chain-pr.yml to eliminate workflow_run dependencies and refine execution conditions.
- Cleaned up supply-chain-verify.yml by removing workflow_run triggers and ensuring proper execution conditions.
- Updated waf-integration.yml to remove workflow_run triggers, allowing manual dispatch only.
- Revised current_spec.md to reflect the consolidation of CI workflows into a single pipeline, detailing objectives, research findings, and implementation plans.

.github/workflows/codecov-upload.yml

@@ -1,12 +1,21 @@
 name: Upload Coverage to Codecov
 
 on:
-  workflow_run:
-    workflows: ["Docker Build, Publish & Test"]
-    types: [completed]
+  workflow_dispatch:
+    inputs:
+      run_backend:
+        description: 'Run backend coverage upload'
+        required: false
+        default: true
+        type: boolean
+      run_frontend:
+        description: 'Run frontend coverage upload'
+        required: false
+        default: true
+        type: boolean
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event.workflow_run.head_branch || github.head_ref || github.ref_name }}
+  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.run_id }}
   cancel-in-progress: true
 
 env:
@@ -22,13 +31,13 @@ jobs:
     name: Backend Codecov Upload
     runs-on: ubuntu-latest
     timeout-minutes: 15
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: ${{ inputs.run_backend != false }}
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 0
-          ref: ${{ github.event.workflow_run.head_sha || github.sha }}
+          ref: ${{ github.sha }}
 
       - name: Set up Go
         uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6
@@ -56,13 +65,13 @@ jobs:
     name: Frontend Codecov Upload
     runs-on: ubuntu-latest
     timeout-minutes: 15
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: ${{ inputs.run_frontend != false }}
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 0
-          ref: ${{ github.event.workflow_run.head_sha || github.sha }}
+          ref: ${{ github.sha }}
 
       - name: Set up Node.js
         uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6