feat: add OpenCode agent provider with DeepSeek support

- Copy opencode provider files from upstream/providers
- Add self-registration imports to host and container barrels
- Install @opencode-ai/sdk@1.4.17 in agent-runner
- Add opencode-ai@1.4.17 to container Dockerfile
- Configure .env template for DeepSeek

container/agent-runner/bun.lock

@@ -7,6 +7,7 @@
       "dependencies": {
         "@anthropic-ai/claude-agent-sdk": "^0.2.128",
         "@modelcontextprotocol/sdk": "^1.12.1",
+        "@opencode-ai/sdk": "1.4.17",
         "cron-parser": "^5.0.0",
         "zod": "^4.0.0",
       },
@@ -44,6 +45,8 @@
 
     "@modelcontextprotocol/sdk": ["@modelcontextprotocol/sdk@1.29.0", "", { "dependencies": { "@hono/node-server": "^1.19.9", "ajv": "^8.17.1", "ajv-formats": "^3.0.1", "content-type": "^1.0.5", "cors": "^2.8.5", "cross-spawn": "^7.0.5", "eventsource": "^3.0.2", "eventsource-parser": "^3.0.0", "express": "^5.2.1", "express-rate-limit": "^8.2.1", "hono": "^4.11.4", "jose": "^6.1.3", "json-schema-typed": "^8.0.2", "pkce-challenge": "^5.0.0", "raw-body": "^3.0.0", "zod": "^3.25 || ^4.0", "zod-to-json-schema": "^3.25.1" }, "peerDependencies": { "@cfworker/json-schema": "^4.1.1" }, "optionalPeers": ["@cfworker/json-schema"] }, "sha512-zo37mZA9hJWpULgkRpowewez1y6ML5GsXJPY8FI0tBBCd77HEvza4jDqRKOXgHNn867PVGCyTdzqpz0izu5ZjQ=="],
 
+    "@opencode-ai/sdk": ["@opencode-ai/sdk@1.4.17", "", { "dependencies": { "cross-spawn": "7.0.6" } }, "sha512-fb60CIZussOZNpYtmVkayUgeN5fodZ0QWAgUWhMev+CoTbskAoCVF1evKZHfPOeKTxw7hmKMi/DjWBCwLDEh4Q=="],
+
     "@types/bun": ["@types/bun@1.3.12", "", { "dependencies": { "bun-types": "1.3.12" } }, "sha512-DBv81elK+/VSwXHDlnH3Qduw+KxkTIWi7TXkAeh24zpi5l0B2kUg9Ga3tb4nJaPcOFswflgi/yAvMVBPrxMB+A=="],
 
     "@types/node": ["@types/node@22.19.17", "", { "dependencies": { "undici-types": "~6.21.0" } }, "sha512-wGdMcf+vPYM6jikpS/qhg6WiqSV/OhG+jeeHT/KlVqxYfD40iYJf9/AE1uQxVWFvU7MipKRkRv8NSHiCGgPr8Q=="],