docs: add root README with port map and usage

README.md

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+# Corentic MCP Fleet
+
+Production-ready MCP server Docker images for the Corentic infrastructure. Each MCP is a standalone Docker image with SSE transport (via `mcp-proxy`), auto-built by Woodpecker CI on push to `main`.
+
+## Port Map
+
+| Port | MCP | Base | Transport |
+|------|-----|------|-----------|
+| 8101 | forgejo | node | mcp-proxy |
+| 8102 | woodpecker | node | mcp-proxy |
+| 8103 | semaphore | python | native HTTP |
+| 8104 | github | ghcr upstream | stdio |
+| 8105 | nginx-proxy-manager | python+node | mcp-proxy |
+| 8106 | taiga | node | mcp-proxy |
+| 8107 | nextcloud | python+node | mcp-proxy |
+| 8108 | kdrive | node | mcp-proxy |
+| 8109 | postgresql | node | mcp-proxy |
+| 8110 | portainer | python+node | mcp-proxy |
+| 8111 | kontist | node | mcp-proxy |
+| 8112 | bitwarden | node+bw CLI | mcp-proxy |
+| 8113 | networking | node | mcp-proxy |
+| 8114 | filesystem | node | mcp-proxy |
+| 8115 | docker | node | mcp-proxy |
+| 8116 | web-search | python+node | mcp-proxy |
+
+## Registry
+
+All images are published to `forgejo.corentic.eu/corentic/mcp-fleet-<name>:latest`.
+
+## Usage
+
+```bash
+docker run -d --name <name>-mcp -p <port>:<port> \
+  -e <ENV_VAR>=<value> \
+  forgejo.corentic.eu/corentic/mcp-fleet-<name>:latest
+```
+
+See each MCP's `README.md` for specific environment variables and tools.
+
+## Non-Docker MCPs
+
+These MCPs run natively or are remote endpoints (no Docker image):
+
+- **playwright/** — Browser automation, runs better natively (needs display + browser)
+- **contextforge/** — Remote SSE gateway, no server to run locally