fix: update Dockerfiles for upstream changes and build fixes

- gitea-mcp, mcp-grafana: bump Go from 1.24 to 1.26 (upstream go.mod
  now requires >= 1.26.x)
- proxmox-mcp: constrain requires-python to >=3.10 for fastmcp compat
- elasticsearch-mcp: add missing vendor repo to CloneVendorRepos.sh
  (elastic/mcp-server-elasticsearch)
- context7-mcp: add .npmrc to disable pnpm v10 strict built-deps check
- drawio-mcp: exclude dev-proxy package from build (upstream TS errors),
  build with pnpm v10 + .npmrc
- discourse-mcp, ghidra-mcp: remain blocked (upstream issues)

dockerfiles/context7-mcp/Dockerfile

@@ -1,13 +1,15 @@
 FROM node:22-alpine
 
-# Install pnpm for monorepo
+# Install pnpm
 RUN npm install -g pnpm
 
 WORKDIR /app
 
 COPY package.json pnpm-lock.yaml ./
 
-RUN pnpm install --frozen-lockfile
+# Disable strict built-dependencies check (pnpm v10 exits on ignored builds)
+RUN echo "strict-built-dependencies=false" > .npmrc && \
+    pnpm install --frozen-lockfile
 
 COPY . .