chore: reorganize into polyglot monorepo (workshop)

- Move bigmind/ -> mcp/bigmind/
- Move webscraper/ -> mcp/webscraper/
- Move mss-failsafe/ -> java/mss-failsafe/
- Move Wellmann-Shop/ -> java/wellmann-shop/ (normalize to kebab-case)
- Add .roo/ IDE config files to tracking
- Add plans/REPO_STRATEGY.md (monorepo strategy document)
- Expand .gitignore: Java/Maven, Node/TS, coverage, uv.lock
- Rewrite README.md as navigation index
- Update .roo/mcp.json webscraper path to mcp/webscraper/

.roo/mcp.json

@@ -0,0 +1,35 @@
+{
+	"mcpServers": {
+		"git": {
+			"command": "uvx",
+			"args": [
+				"mcp-server-git",
+				"--repository",
+				"/home/pplate/pi_mcps/"
+			],
+			"alwaysAllow": [
+				"*"
+			]
+		},
+		"filesystem": {
+			"command": "npx",
+			"args": [
+				"-y",
+				"@modelcontextprotocol/server-filesystem",
+				"/home/pplate/"
+			]
+		},
+		"webscraper": {
+			"command": "uv",
+			"args": [
+				"run",
+				"--directory",
+				"/home/pplate/pi_mcps/mcp/webscraper",
+				"src/server.py"
+			],
+			"alwaysAllow": [
+				"webscraper_fetch"
+			]
+		}
+	}
+}