feat: replace custom Gitea client with MCP servers

Replace the bespoke GiteaHand httpx client and tools_gitea.py wrappers
with official MCP tool servers (gitea-mcp + filesystem MCP), wired into
Agno via MCPTools. Switch all session functions to async (arun/acontinue_run)
so MCP tools auto-connect. Delete ~1070 lines of custom Gitea code.

- Create src/timmy/mcp_tools.py with MCP factories + standalone issue bridge
- Wire MCPTools into agent.py tool list (Gitea + filesystem)
- Switch session.py chat/chat_with_tools/continue_chat to async
- Update all callers (dashboard routes, Discord vendor, CLI, thinking engine)
- Add gitea_token fallback from ~/.config/gitea/token
- Add MCP session cleanup to app shutdown hook
- Update tool_safety.py for MCP tool names
- 11 new tests, all 1417 passing, coverage 74.2%

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -44,6 +44,7 @@ airllm = { version = ">=2.9.0", optional = true }
 pyttsx3 = { version = ">=2.90", optional = true }
 sentence-transformers = { version = ">=2.0.0", optional = true }
 numpy = { version = ">=1.24.0", optional = true }
+mcp = { version = ">=1.0.0", optional = true }
 requests = { version = ">=2.31.0", optional = true }
 GitPython = { version = ">=3.1.40", optional = true }
 pytest = { version = ">=8.0.0", optional = true }
@@ -62,6 +63,7 @@ voice = ["pyttsx3"]
 celery = ["celery"]
 embeddings = ["sentence-transformers", "numpy"]
 git = ["GitPython"]
+mcp = ["mcp"]
 dev = ["pytest", "pytest-asyncio", "pytest-cov", "pytest-timeout", "pytest-randomly", "pytest-xdist", "selenium"]
 
 [tool.poetry.group.dev.dependencies]