feat: enhance text protocol conversion and advanced custom routing (#5825)

* refactor: consolidate relay protocol converters

* refactor relayconvert text converters

* feat: refine relay converters and advanced custom routing

* refactor: enhance logging and add thought signature handling for Gemini requests

* refactor: enhance channel cache and pricing endpoint handling for advanced custom models

* feat: preserve billing usage semantics

* feat: add protocol-aware billing usage

* Delete useless files

* chore: update action versions in workflow files

* chore: update Docker action versions in workflow files

* fix: harden billing usage settlement and hot-path route matching

- estimate Gemini completion tokens locally when billable usageMetadata is
  prompt-only but output content was received (e.g. client aborts the stream
  before the final chunk), and rebuild the attached billing_usage as estimated
  so settlement does not bill zero output tokens
- guard NewClaudeMessagesBillingUsage against all-zero ClaudeUsage, matching
  the OpenAI/Gemini constructors, so a zero billing_usage cannot override a
  non-zero top-level usage during settlement
- cache compiled advanced-custom route model regexes; they run on the request
  hot path and were recompiled per request
- move the effectiveBillingUsage remap to PostTextConsumeQuota only, and
  document that calculateTextQuotaSummary expects remapped usage
- document the updatePricingLock -> channelSyncLock lock ordering that
  InitChannelCache/CacheUpdateChannel rely on, and the aux-struct pitfall in
  GeminiChatResponse.UnmarshalJSON

.github/workflows/release.yml

@@ -19,14 +19,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           fetch-depth: 0
       - name: Determine Version
         run: |
           VERSION=$(git describe --tags)
           echo "VERSION=$VERSION" >> $GITHUB_ENV
-      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
+      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
         with:
           bun-version: latest
       - name: Build Frontend (default)
@@ -48,7 +48,7 @@ jobs:
           VITE_REACT_APP_VERSION=$VERSION bun run build
           cd ../..
       - name: Set up Go
-        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
+        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
         with:
           go-version: '>=1.25.1'
       - name: Build Backend (amd64)
@@ -64,7 +64,7 @@ jobs:
         run: sha256sum new-api-* > checksums-linux.txt
 
       - name: Release
-        uses: softprops/action-gh-release@153bb8e04406b158c6c84fc1615b65b24149a1fe # v2
+        uses: softprops/action-gh-release@718ea10b132b3b2eba29c1007bb80653f286566b # v3.0.1
         if: startsWith(github.ref, 'refs/tags/')
         with:
           files: |
@@ -78,14 +78,14 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           fetch-depth: 0
       - name: Determine Version
         run: |
           VERSION=$(git describe --tags)
           echo "VERSION=$VERSION" >> $GITHUB_ENV
-      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
+      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
         with:
           bun-version: latest
       - name: Build Frontend (default)
@@ -108,7 +108,7 @@ jobs:
           VITE_REACT_APP_VERSION=$VERSION bun run build
           cd ../..
       - name: Set up Go
-        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
+        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
         with:
           go-version: '>=1.25.1'
       - name: Build Backend
@@ -119,7 +119,7 @@ jobs:
         run: shasum -a 256 new-api-macos-* > checksums-macos.txt
 
       - name: Release
-        uses: softprops/action-gh-release@153bb8e04406b158c6c84fc1615b65b24149a1fe # v2
+        uses: softprops/action-gh-release@718ea10b132b3b2eba29c1007bb80653f286566b # v3.0.1
         if: startsWith(github.ref, 'refs/tags/')
         with:
           files: |
@@ -136,14 +136,14 @@ jobs:
         shell: bash
     steps:
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           fetch-depth: 0
       - name: Determine Version
         run: |
           VERSION=$(git describe --tags)
           echo "VERSION=$VERSION" >> $GITHUB_ENV
-      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
+      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
         with:
           bun-version: latest
       - name: Build Frontend (default)
@@ -165,7 +165,7 @@ jobs:
           VITE_REACT_APP_VERSION=$VERSION bun run build
           cd ../..
       - name: Set up Go
-        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
+        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
         with:
           go-version: '>=1.25.1'
       - name: Build Backend
@@ -176,7 +176,7 @@ jobs:
         run: sha256sum new-api-*.exe > checksums-windows.txt
 
       - name: Release
-        uses: softprops/action-gh-release@153bb8e04406b158c6c84fc1615b65b24149a1fe # v2
+        uses: softprops/action-gh-release@718ea10b132b3b2eba29c1007bb80653f286566b # v3.0.1
         if: startsWith(github.ref, 'refs/tags/')
         with:
           files: |