fix: import mcp json streamable http configs

[fancyboi999]

Summary

• import userData/mcp.json into the existing SQLite-backed MCP store at startup
• normalize external streamable_http configs into LobsterAI's internal http transport
• clarify the MCP form so SSE and Streamable HTTP are clearly distinguished in the UI

Root Cause

Issue #351 mixed together two separate gaps:

• LobsterAI did not read external mcp.json files at all, so dropping a file into the app data directory never surfaced servers in the UI
• the app internally uses http for streamable HTTP MCP transport, but external configs commonly use streamable_http, and the UI did not make that distinction obvious enough

Solution

• add a startup sync layer that reads mcp.json, validates entries, maps streamable_http/streamable-http to http, and writes imported entries into mcp_servers
• mark imported entries with source metadata so subsequent syncs can update/remove only mcp.json-managed records without overriding manually configured servers
• add regression coverage for mcp.json import behavior and alias normalization
• update transport labels/hints in the MCP form to steer remote HTTP MCP users to Streamable HTTP

Validation

• npx -p node@24 -p npm@11 -c "npm run compile:electron"
• npx -p node@24 -c "node --test tests/mcpJsonSync.test.mjs tests/coworkOpenAICompatProxy.sseBoundary.test.mjs tests/coworkOpenAICompatProxy.responses.test.mjs"
• npx -p node@24 -c "./node_modules/.bin/eslint src/main/mcpJsonSync.ts src/main/mcpStore.ts src/main/main.ts src/renderer/components/mcp/McpServerFormModal.tsx src/renderer/services/i18n.ts tests/mcpJsonSync.test.mjs"
• npx -p node@24 -p npm@11 -c "npm run build"
• manually verified a local test MCP service reproduces the 406 Not Acceptable response when the client only accepts text/event-stream, and succeeds when the client accepts both application/json, text/event-stream
• manually verified mcp.json import turns a streamable_http entry into internal transportType: "http"

Notes

• full npm run lint -- --quiet still reports pre-existing unrelated lint errors in src/main/im/nimGateway.ts and src/main/im/xiaomifengGateway.ts

Closes #351

[github-actions]

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