feat: add environments — parametric ticket ID prefixes, env selector UI, MCP tools

- Environment model (prefix, name, description) with CRUD API
- Ticket.human_id now computed from environment prefix (e.g. PROJ-001)
- Migration 0002: environments table + backfill existing tickets to HOME env
- Router: list/create/get/patch/delete environments; list_tickets + create_ticket accept environment_id
- MCP: list_environments, create_environment tools; environment_id added to list_tickets + create_ticket
- UI: env pill selector with dropdown, new-environment modal, filter tickets by env

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

mcp_server.py

@@ -91,21 +91,53 @@ def _check(r: httpx.Response) -> dict | list:
     return r.json()
 
 
+# ── Environment tools ─────────────────────────────────────────────────────────
+
+@mcp.tool()
+def list_environments() -> list[dict]:
+    """
+    List all ticket environments (prefix + name). Each environment scopes a
+    set of tickets with its own ID prefix (e.g. HOME-001, PROJ-001).
+    """
+    with _client() as c:
+        return _check(c.get("/api/environments"))
+
+
+@mcp.tool()
+def create_environment(prefix: str, name: str, description: str = "") -> dict:
+    """
+    Create a new ticket environment.
+
+    Args:
+        prefix:      Short uppercase identifier, e.g. PROJ or LAB (max 16 chars).
+        name:        Human-readable name, e.g. "My Project".
+        description: Optional longer description.
+    """
+    with _client() as c:
+        return _check(c.post("/api/environments", json={
+            "prefix":      prefix.upper(),
+            "name":        name,
+            "description": description or None,
+        }))
+
+
 # ── Ticket tools ──────────────────────────────────────────────────────────────
 
 @mcp.tool()
-def list_tickets(status: str = "", type: str = "", q: str = "") -> list[dict]:
+def list_tickets(status: str = "", type: str = "", q: str = "",
+                 environment_id: int = 0) -> list[dict]:
     """
     List homelab tickets. Results include attachment_count so you know
     which tickets have supporting documents without fetching them.
 
     Args:
-        status: Filter by status — open, ongoing, completed, abandoned.
-                Leave empty to list all statuses.
-        type:   Filter by type — feature, bug, chore, project.
-                Leave empty to list all types.
-        q:      Full-text search query matched against ticket title and
-                description (case-insensitive). Leave empty to skip.
+        status:         Filter by status — open, ongoing, completed, abandoned.
+                        Leave empty to list all statuses.
+        type:           Filter by type — feature, bug, chore, project.
+                        Leave empty to list all types.
+        q:              Full-text search query matched against ticket title and
+                        description (case-insensitive). Leave empty to skip.
+        environment_id: Filter by environment ID. Pass 0 (default) for all environments.
     """
     with _client() as c:
         params = {}
@@ -115,6 +147,8 @@ def list_tickets(status: str = "", type: str = "", q: str = "") -> list[dict]:
             params["type"] = type
         if q:
             params["q"] = q
+        if environment_id:
+            params["environment_id"] = environment_id
         return _check(c.get("/api/tickets", params=params))
 
 
@@ -133,13 +167,14 @@ def get_ticket(ticket_id: int) -> dict:
 
 @mcp.tool()
 def create_ticket(
-    title:       str,
-    description: str = "",
-    status:      str = "open",
-    type:        str = "feature",
-    user:        str = "claude",
-    parent_id:   int = 0,
-    effort:      int = 0,
+    title:          str,
+    description:    str = "",
+    status:         str = "open",
+    type:           str = "feature",
+    user:           str = "claude",
+    parent_id:      int = 0,
+    effort:         int = 0,
+    environment_id: int = 0,
 ) -> dict:
     """
     Create a new homelab ticket. For longer supporting documents
@@ -147,13 +182,16 @@ def create_ticket(
     everything into description.
 
     Args:
-        title:       Short summary of the work item.
-        description: Markdown body with context, links, acceptance criteria.
-        status:      open (default), ongoing, completed, abandoned.
-        type:        feature (default), bug, chore, project.
-        user:        Who is submitting — kevin or claude (default: claude).
-        parent_id:   ID of the parent ticket (omit or pass 0 for no parent).
-        effort:      Estimated effort rating 1–10 (omit or pass 0 to leave unset).
+        title:          Short summary of the work item.
+        description:    Markdown body with context, links, acceptance criteria.
+        status:         open (default), ongoing, completed, abandoned.
+        type:           feature (default), bug, chore, project.
+        user:           Who is submitting — kevin or claude (default: claude).
+        parent_id:      ID of the parent ticket (omit or pass 0 for no parent).
+        effort:         Estimated effort rating 1–10 (omit or pass 0 to leave unset).
+        environment_id: Environment to file the ticket in. Pass 0 to use the
+                        default environment (HOME). Use list_environments() to
+                        find available environments.
     """
     body: dict = {
         "title":       title,
@@ -166,6 +204,8 @@ def create_ticket(
         body["parent_id"] = parent_id
     if effort:
         body["effort"] = effort
+    if environment_id:
+        body["environment_id"] = environment_id
     with _client() as c:
         ticket = _check(c.post("/api/tickets", json=body))
         script = _generate_startup_script(