Release v0.3.0

BREAKING CHANGES:

• ENV MCP_PROXY_SSE_ALLOWED_KEYS renamed to ALLOWED_KEYS （X-Api-Key auth header）
• Add ENV ALLOWED_TOKENS (for Bearer auth header)
• Add a "type" field in the server section of the mcp_server.json configuration file to distinguish server types (stdio/sse/http).

Feature

• feat: Add Bearer Token authentication support for SSE endpoint and update READMEs
• feat: initial support for streamable HTTP endpoint /mcp
• feat: Add Streamable HTTP support, update Admin UI, and refactor config

Chore

• chore(version): bump addon version

Refactor

• refactor: Remove debug logging and SDK overrides

Other

• doc: improve readme
• doc: improve GHCR URL